SBASA81B January   2023  – October 2024 ADS9815 , ADS9817

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Switching Characteristics
    8. 5.8 Timing Diagrams
    9. 5.9 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Analog Inputs
        1. 6.3.1.1 Input Clamp Protection Circuit
        2. 6.3.1.2 Programmable Gain Amplifier (PGA)
        3. 6.3.1.3 Wide-Common-Mode Voltage Rejection Circuit
        4. 6.3.1.4 Gain Error Calibration
      2. 6.3.2 ADC Transfer Function
      3. 6.3.3 ADC Sampling Clock Input
      4. 6.3.4 Reference
        1. 6.3.4.1 Internal Reference Voltage
        2. 6.3.4.2 External Reference Voltage
      5. 6.3.5 Sample Synchronization
      6. 6.3.6 Data Interface
        1. 6.3.6.1 Data Clock Output
        2. 6.3.6.2 ADC Output Data Randomizer
        3. 6.3.6.3 Test Patterns for Data Interface
          1. 6.3.6.3.1 Fixed Pattern
          2. 6.3.6.3.2 Digital Ramp
          3. 6.3.6.3.3 Alternating Test Pattern
    4. 6.4 Device Functional Modes
      1. 6.4.1 Power-Down
      2. 6.4.2 Reset
      3. 6.4.3 Initialization Sequence
      4. 6.4.4 Normal Operation
    5. 6.5 Programming
      1. 6.5.1 Register Write
      2. 6.5.2 Register Read
      3. 6.5.3 Multiple Devices: Daisy-Chain Topology for SPI Configuration
        1. 6.5.3.1 Register Write With Daisy-Chain
        2. 6.5.3.2 Register Read With Daisy-Chain
  8. 7 Register Map
    1. 7.1 Register Bank 0
    2. 7.2 Register Bank 1
    3. 7.3 Register Bank 2
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Parametric Measurement Unit (PMU)
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
      4. 8.2.4 Application Curve
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.2 Register Bank 1

Figure 7-12 Register Bank 1 Map
ADD D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0Dh RESERVED DATA_FORMAT RESERVED GE_CAL_EN1 RESERVED
12h RESERVED XOR_EN RESERVED
13h RESERVED RAMP_INC_A TP_MODE_CH[4:1] TP_EN_CH[4:1] RESERVED
14h TP0_A
15h TP1_A TP0_A
16h TP1_A
18h RESERVED RAMP_INC_B TP_MODE_CH[8:5] TP_EN_CH[8:5] RESERVED
19h TP0_B
1Ah TP1_B TP0_B
1Bh TP1_B
1Ch RESERVED USER_BITS_CH[8:5] RESERVED USER_BITS_CH[4:1]
33h RESERVED GE_CAL_EN3 RESERVED GE_CAL_EN2 INIT_KEY RESERVED
34h RESERVED GE_CAL_EN4 RESERVED
C0h RESERVED ANA_BW PD_CH
C1h RESERVED PD_REF RESERVED DATA_LANES DATA_RATE RESERVED
C2h RANGE_CH4 RANGE_CH3 RANGE_CH2 RANGE_CH1
C3h RANGE_CH8 RANGE_CH7 RANGE_CH6 RANGE_CH5
C4h RESERVED CM_RNG_CH[8:5] CM_RNG_CH[4:1] RESERVED CM_EN_CH[8:5] CM_EN_CH[4:1] RESERVED PD_CHIP
C5h RESERVED CM_CTRL_EN RESERVED
F4h RESERVED INIT RESERVED
F6h RESERVED INIT_2 RESERVED
Table 7-2 Register Section/Block Access Type Codes
Access Type Code Description
R R Read
W W Write
R/W R/W Read or write
Reset or Default Value
-n Value after reset or the default value

Register 0Dh (offset = Dh) [reset = 2002h]

Figure 7-13 Register 0Dh
15 14 13 12 11 10 9 8
RESERVED DATA_FORMAT RESERVED GE_CAL_EN1
R/W-0h R/W-1h R/W-0h R/W-0h
7 6 5 4 3 2 1 0
GE_CAL_EN1 RESERVED
R/W-0h R/W-2h
Figure 7-14 Register 0Dh Field Descriptions
Bit Field Type Reset Description
15-14 RESERVED R/W 0h Reserved. Do not change from the default reset value.
13 DATA_FORMAT R/W 1h Select data format for the ADC conversion result.
0 : Straight binary format
1 : Two's-complement format
12-9 RESERVED R/W 0h Reserved. Do not change from the default reset value.
8-7 GE_CAL_EN1 R/W 0h Global control for gain error calibration.
0 : Gain error calibration disabled for all channels
3 : Gain error calibration enabled for all channels
6-0 RESERVED R/W 2h Reserved. Do not change from the default reset value.

7.2.1 Register 12h (offset = 12h) [reset = 2h]

Figure 7-15 Register 12h
15 14 13 12 11 10 9 8
RESERVED
R/W-0h
7 6 5 4 3 2 1 0
RESERVED XOR_EN RESERVED
R/W-0h R/W-0h R/W-2h
Figure 7-16 Register 12h Field Descriptions
Bit Field Type Reset Description
15-4 RESERVED R/W 0h Reserved. Do not change from the default reset value.
3 XOR_EN R/W 0h Enables XOR operation on ADC conversion result.
0 : XOR operation is disabled
1 : ADC conversion result is bit-wise XOR with the LSB of the ADC conversion result
2-0 RESERVED R/W 2h Reserved. Do not change from the default reset value.

7.2.2 Register 13h (offset = 13h) [reset = 0h]

Figure 7-17 Register 13h
15 14 13 12 11 10 9 8
RESERVED
R/W-0h
7 6 5 4 3 2 1 0
RAMP_INC_A TP_MODE_CH[4:1] TP_EN_CH[4:1] RESERVED
R/W-0h R/W-0h R/W-0h R/W-0h
Figure 7-18 Register 13h Field Descriptions
Bit Field Type Reset Description
15-8 RESERVED R/W 0h Reserved. Do not change from the default reset value.
7-4 RAMP_INC_A R/W 0h Increment value for the ramp pattern output. The output ramp increments by N+1, where N is the value configured in this register.
3-2 TP_MODE_CH[4:1] R/W 0h Select digital test pattern for analog input channels 1, 2, 3, and 4.
0 : Fixed pattern from the TP0_A register
1 : Fixed pattern from the TP0_A register
2 : Digital ramp output
3 : Alternate fixed pattern output from the TP0_A and TP1_A registers
1 TP_EN_CH[4:1] R/W 0h Enable digital test pattern for data corresponding to analog input channels 1, 2, 3, and 4.
0 : Data output is the ADC conversion result
1 : Data output is the digital test pattern
0 RESERVED R/W 0h Reserved. Do not change from the default reset value.

7.2.3 Register 14h (offset = 14h) [reset = 0h]

Figure 7-19 Register 14h
15 14 13 12 11 10 9 8
TP0_A[15:0]
R/W-0h
7 6 5 4 3 2 1 0
TP0_A[15:0]
R/W-0h
Figure 7-20 Register 14h Field Descriptions
Bit Field Type Reset Description
15-0 TP0_A[15:0] R/W 0h Lower 16 bits of test pattern 0

7.2.4 Register 15h (offset = 15h) [reset = 0h]

Figure 7-21 Register 15h
15 14 13 12 11 10 9 8
TP1_A[7:0]
R/W-0h
7 6 5 4 3 2 1 0
TP0_A[23:16]
R/W-0h
Figure 7-22 Register 15h Field Descriptions
Bit Field Type Reset Description
15-8 TP1_A[7:0] R/W 0h Lower eight bits of test pattern 1
7-0 TP0_A[23:16] R/W 0h Upper eight bits of test pattern 0

7.2.5 Register 16h (offset = 16h) [reset = 0h]

Figure 7-23 Register 16h
15 14 13 12 11 10 9 8
TP1_A[23:8]
R/W-0h
7 6 5 4 3 2 1 0
TP1_A[23:8]
R/W-0h
Figure 7-24 Register 16h Field Descriptions
Bit Field Type Reset Description
15-0 TP1_A[23:8] R/W 0h Upper 16 bits of test pattern 1

Register 18h (offset = 18h) [reset = 0h]

Figure 7-25 Register 18h
15 14 13 12 11 10 9 8
RESERVED
R/W-0h
7 6 5 4 3 2 1 0
RAMP_INC_B TP_MODE_B TP_EN_B RESERVED
R/W-0h R/W-0h R/W-0h R/W-0h
Figure 7-26 Register 18h Field Descriptions
Bit Field Type Reset Description
15-8 RESERVED R/W 0h Reserved. Do not change from the default reset value.
7-4 RAMP_INC_B R/W 0h Increment value for the ramp pattern output. The output ramp increments by N+1, where N is the value configured in this register.
3-2 TP_MODE_CH[8:5] R/W 0h Select digital test pattern for analog input channels 5, 6, 7, and 8.
0 : Fixed pattern from the TP0_B register
1 : Fixed pattern from the TP0_B register
2 : Digital ramp output
3 : Alternate fixed pattern output from the TP0_B and TP1_B registers
1 TP_EN_CH[8:5] R/W 0h Enable digital test pattern for data corresponding to analog input channels 5, 6, 7, and 8.
0 : Data output is the ADC conversion result
1 : Data output is the digital test pattern
0 RESERVED R/W 0h Reserved. Do not change from the default reset value.

7.2.6 Register 19h (offset = 19h) [reset = 0h]

Figure 7-27 Register 19h
15 14 13 12 11 10 9 8
TP0_B[15:0]
R/W-0h
7 6 5 4 3 2 1 0
TP0_B[15:0]
R/W-0h
Figure 7-28 Register 19h Field Descriptions
Bit Field Type Reset Description
15-0 TP0_B[15:0] R/W 0h Lower 16 bits of test pattern 0

7.2.7 Register 1Ah (offset = 1Ah) [reset = 0h]

Figure 7-29 Register 1Ah
15 14 13 12 11 10 9 8
TP1_B[7:0]
R/W-0h
7 6 5 4 3 2 1 0
TP0_B[23:16]
R/W-0h
Figure 7-30 Register 1Ah Field Descriptions
Bit Field Type Reset Description
15-8 TP1_B[7:0] R/W 0h Lower eight bits of test pattern 1
7-0 TP0_B[23:16] R/W 0h Upper eight bits of test pattern 0

7.2.8 Register 1Bh (offset = 1Bh) [reset = 0h]

Figure 7-31 Register 1Bh
15 14 13 12 11 10 9 8
TP1_B[23:8]
R/W-0h
7 6 5 4 3 2 1 0
TP1_B[23:8]
R/W-0h
Figure 7-32 Register 1Bh Field Descriptions
Bit Field Type Reset Description
15-0 TP1_B[23:8] R/W 0h Upper 16 bits of test pattern 1

Register 1Ch (offset = 1Ch) [reset = 0h]

Figure 7-33 Register 1Ch
15 14 13 12 11 10 9 8
RESERVED USER_BITS_CH[8:5]
R/W-0h R/W-0h
7 6 5 4 3 2 1 0
RESERVED USER_BITS_CH[4:1]
R/W-0h R/W-0h
Figure 7-34 Register 1Ch Field Descriptions
Bit Field Type Reset Description
15-8 USER_BITS_CH[8:5] R/W 0h User-defined bits appended to the ADC conversion result from analog input channels 5, 6, 7, and 8.
7-0 USER_BITS_CH[4:1] R/W 0h User-defined bits appended to the ADC conversion result from analog input channels 1, 2, 3, and 4.

7.2.9 Register 33h (offset = 33h) [reset = 0h]

Figure 7-35 Register 33h
15 14 13 12 11 10 9 8
RESERVED GE_CAL_EN3 RESERVED
R/W-0h R/W-0h R/W-0h
7 6 5 4 3 2 1 0
RESERVED GE_CAL_EN2 INIT_KEY RESERVED
R/W-0h R/W-0h R/W-0h R/W-0h
Figure 7-36 Register 33h Field Descriptions
Bit Field Type Reset Description
15-14 RESERVED R/W 0h Reserved. Do not change from the default reset value.
13 GE_CAL_EN3 R/W 0h Global control for gain error calibration.
0 : Gain error calibration disabled for all channels
1 : Gain error calibration enabled for all channels
12-7 RESERVED R/W 0h Reserved. Do not change from the default reset value.
6 GE_CAL_EN2 R/W 0h Global control for gain error calibration.
0 : Gain error calibration disabled for all channels
1 : Gain error calibration enabled for all channels
5-4 INIT_KEY R/W 0h Device initialization sequence access key. Write 11b to access the device initialization sequence. Write 00b for normal operation.
3-0 RESERVED R/W 0h Reserved. Do not change from the default reset value.

7.2.10 Register 34h (offset = 34h) [reset = 0h]

Figure 7-37 Register 34h
15 14 13 12 11 10 9 8
RESERVED
R/W-0h
7 6 5 4 3 2 1 0
RESERVED GE_CAL_EN4 RESERVED
R/W-0h R/W-0h R/W-0h
Figure 7-38 Register 34h Field Descriptions
Bit Field Type Reset Description
15-5 RESERVED R/W 0h Reserved. Do not change from the default reset value.
4 GE_CAL_EN4 R/W 0h Global control for gain error calibration.
0 : Gain error calibration disabled for all channels
1 : Gain error calibration enabled for all channels
3-0 RESERVED R/W 0h Reserved. Do not change from the default reset value.

7.2.11 Register C0h (offset = C0h) [reset = 0h]

Figure 7-39 Register C0h
15 14 13 12 11 10 9 8
RESERVED ANA_BW
R/W-0h R/W-0h
7 6 5 4 3 2 1 0
ANA_BW PD_CH
R/W-0h R/W-0h
Figure 7-40 Register C0h Field Descriptions
Bit Field Type Reset Description
15-10 RESERVED R/W 0h Reserved. Do not change from the default reset value.
9-2 ANA_BW R/W 0h Select analog input bandwidth for the respective analog input channels.
MSB = BW control for channel 8.
LSB = BW control for channel 1.
0 : Low-noise mode
1 : Wide-bandwidth mode
1-0 PD_CH R/W 0h Power-down control for the analog input channels.
0 : Normal operation
1 : Analog input channels 5, 6, 7, and 8 powered down
2 : Analog input channels 1, 2, 3, and 4 powered down
3 : All channels powered down

7.2.12 Register C1h (offset = C1h) [reset = 0h]

Figure 7-41 Register C1h
15 14 13 12 11 10 9 8
RESERVED PD_REF RESERVED DATA_LANES DATA_RATE
R/W-0h R/W-0h R/W-0h R/W-0h R/W-0h
7 6 5 4 3 2 1 0
RESERVED
R/W-0h
Figure 7-42 Register C1h Field Descriptions
Bit Field Type Reset Description
15-12 RESERVED R/W 0h Reserved. Do not change from the default reset value.
11 PD_REF R/W 0h ADC reference voltage source selection.
0 : Internal reference enabled.
1 : Internal reference disabled. Connect the external reference voltage to the REFIO pin.
10 RESERVED R/W 0h Reserved. Do not change from the default reset value.
9 DATA_LANES R/W 0h Select number of output data lanes per ADC channel.
0 : 4-lane mode. CH[4:1] data are output on pins D3 and D2. CH[8:5] data are output on pins D1 and D0.
1 : 2-lane mode. CH[4:1] data are output on pin D3. CH[8:5] data are output on pin D1.
8 DATA_RATE R/W 0h Select data rate for the data interface.
0 : Double data rate (DDR)
1 : Single data rate (SDR)
7-0 RESERVED R/W 0h Reserved. Do not change from the default reset value.

7.2.13 Register C2h (offset = C2h) [reset = 0h]

Figure 7-43 Register C2h
15 14 13 12 11 10 9 8
RANGE_CH4 RANGE_CH3
R/W-0h R/W-0h
7 6 5 4 3 2 1 0
RANGE_CH2 RANGE_CH1
R/W-0h R/W-0h
Figure 7-44 Register C2h Field Descriptions
Bit Field Type Reset Description
15-12 RANGE_CH4 R/W 0h Select input voltage range for respective ADC channels.
0 : ±5V
1 : ±3.5V
2 : ±2.5V
3 : ±7V
4 : ±10V
5 : ±12V
11-8 RANGE_CH3 R/W 0h
7-4 RANGE_CH2 R/W 0h
3-0 RANGE_CH1 R/W 0h

7.2.14 Register C3h (offset = C3h) [reset = 0h]

Figure 7-45 Register C3h
15 14 13 12 11 10 9 8
RANGE_CH8 RANGE_CH7
R/W-0h R/W-0h
7 6 5 4 3 2 1 0
RANGE_CH6 RANGE_CH5
R/W-0h R/W-0h
Figure 7-46 Register C3h Field Descriptions
Bit Field Type Reset Description
15-12 RANGE_CH8 R/W 0h Select input voltage range for respective ADC channels.
0 : ±5V
1 : ±3.5V
2 : ±2.5V
3 : ±7V
4 : ±10V
5 : ±12V
11-8 RANGE_CH7 R/W 0h
7-4 RANGE_CH6 R/W 0h
3-0 RANGE_CH5 R/W 0h

7.2.15 Register C4h (offset = C4h) [reset = 0h]

Figure 7-47 Register C4h
15 14 13 12 11 10 9 8
RESERVED CM_RNG_CH[8:5]
R/W-0h R/W-0h
7 6 5 4 3 2 1 0
CM_RNG_CH[4:1] RESERVED CM_EN_CH[8:5] CM_EN_CH[4:1] RESERVED PD_CHIP
R/W-0h R/W-0h R/W-0h R/W-0h R/W-0h R/W-0h
Figure 7-48 Register C4h Field Descriptions
Bit Field Type Reset Description
15-10 RESERVED R/W 0h Reserved. Do not change from the default reset value.
9-8 CM_RNG_CH[8:5] R/W 0h CM_RNG_CH[8:5] sets the common-mode voltage range for analog input channels 5, 6, 7, and 8.
CM_RNG_CH[4:1] sets the common-mode voltage range for analog input channels 1, 2, 3, and 4
0 : CM range equal to ±RANGE / 2
1 : CM range equal to ±6V
2 : CM range equal to ±12V
7-6 CM_RNG_CH[4:1] R/W 0h
5-4 RESERVED R/W 0h Reserved. Do not change from the default reset value.
3 CM_EN_CH[8:5] R/W 0h CM_EN_CH[8:5] enables the common-mode range control for analog input channels 5, 6, 7, and 8.
CM_EN_CH[4:1] enables the common-mode range control for analog input channels 1, 2, 3, and 4
0 : Wide-common-mode range control disabled
1 : Wide-common-mode range control enabled
2 CM_EN_CH[4:1] R/W 0h
1 RESERVED R/W 0h Reserved. Do not change from the default reset value.
0 PD_CHIP R/W 0h Full chip power-down control.
0 : Normal device operation
1 : Full device powered-down

7.2.16 Register C5h (offset = C5h) [reset = 0h]

Figure 7-49 Register C5h
15 14 13 12 11 10 9 8
RESERVED
R/W-0h
7 6 5 4 3 2 1 0
RESERVED CM_CTRL_EN RESERVED
R/W-0h R/W-0h R/W-0h
Figure 7-50 Register C5h Field Descriptions
Bit Field Type Reset Description
15-5 RESERVED R/W 0h Reserved. Do not change from the default reset value.
4 CM_CTRL_EN R/W 0h Enable wide-common-mode range control for all analog input channels.
0 : CM range for all analog input channels is ±12V
1 : CM range is user-defined in the CM_EN_CH[8:5], CM_EN_CH[8:5], CM_RNG_CH[4:1], and CM_RNG_CH[8:5] registers
3-0 RESERVED R/W 0h Reserved. Do not change from the default reset value.

7.2.17 Register F4h (offset = F4h) [reset = 0h]

Figure 7-51 Register F4h
15 14 13 12 11 10 9 8
RESERVED
R/W-0h
7 6 5 4 3 2 1 0
RESERVED INIT RESERVED
R/W-0h R/W-0h R/W-0h
Figure 7-52 Register F4h Field Descriptions
Bit Field Type Reset Description
15-2 RESERVED R/W 0h Reserved. Do not change from the default reset value.
1 INIT R/W 0h INIT field for device initialization. Write 1b during the initialization sequence. Write 0b for normal operation.
0 RESERVED R/W 0h Reserved. Do not change from the default reset value.

7.2.18 Register F6h (offset = F6h) [reset = 0h]

Figure 7-53 Register F6h
15 14 13 12 11 10 9 8
RESERVED
R/W-0h
7 6 5 4 3 2 1 0
RESERVED INIT_2 RESERVED
R/W-0h R/W-0h R/W-0h
Figure 7-54 Register F6h Field Descriptions
Bit Field Type Reset Description
15-2 RESERVED R/W 0h Reserved. Do not change from the default reset value.
1 INIT_2 R/W 0h INIT_2 field for device initialization. Write 1b during the initialization sequence. Write 0b for normal operation.
0 RESERVED R/W 0h Reserved. Do not change from the default reset value.