SBAS784A January 2019 – May 2019 ADS1260-Q1 , ADS1261-Q1
PRODUCTION DATA.
The ADS1260-Q1 and ADS1261-Q1 (ADS126x-Q1) are precision, 40-kSPS, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) that include a programmable gain amplifier (PGA). The devices also include a precision voltage reference and internal fault monitors. The sensor-ready ADCs give a high-accuracy, single-chip solution for the most demanding measurements, for example, weigh scales and resistance temperature detectors (RTDs).
The ADCs contain an input signal multiplexer, a low-noise PGA (with gains from 1 to 128), a 24-bit ΔΣ modulator, a precision voltage reference, and a programmable digital filter.
The high-impedance PGA inputs (1 GΩ) decrease measurement error due to sensor loading. The ADS1260-Q1 supports three differential or five single-ended inputs. The ADS1261-Q1 supports five differential or ten single-ended inputs. The integrated current sources simplify the measurement of RTDs.
The flexible digital filter is programmable for single-cycle settled conversions. Signal and reference monitors, a temperature sensor, and CRC data verification enhance data reliability.
The ADS126x-Q1 are pin compatible devices given in a 5-mm × 5-mm VQFN package and are specified across the –40°C to +125°C temperature range.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
ADS126x-Q1 | VQFN (32) | 5.0 mm × 5.0 mm |
Changes from * Revision (January 2019) to A Revision
PART NUMBER | CHANNELS | REFERENCE INPUTS | GPIOS | |
---|---|---|---|---|
SINGLE-ENDED | DIFFERENTIAL | |||
ADS1260-Q1 | 5 | 3 | 1 | — |
ADS1261-Q1 | 10 | 5 | 2 | 4 |
PIN | TYPE | DESCRIPTION | ||
---|---|---|---|---|
NO. | ADS1260-Q1 | ADS1261-Q1 | ||
1 | AINCOM | AINCOM | Analog
input/output |
Analog input common, IDAC1, IDAC2, VBIAS |
2 | CAPP | CAPP | Analog output | PGA output P; connect a 4.7-nF C0G dielectric capacitor across CAPP and CAPN |
3 | CAPN | CAPN | Analog output | PGA output N; connect a 4.7-nF C0G dielectric capacitor across CAPP and CAPN |
4 | AVDD | AVDD | Analog | Positive analog power supply |
5 | AVSS | AVSS | Analog | Negative analog power supply |
6 | REFOUT | REFOUT | Analog output | Internal 2.5-V reference output; connect a 10-µF capacitor to AVSS |
7 | PWDN | PWDN | Digital input | Power down, active low |
8 | RESET | RESET | Digital input | Reset, active low |
9 | START | START | Digital input | Start conversion control, active high |
10 | CS | CS | Digital input | Serial interface chip select, active low |
11 | SCLK | SCLK | Digital Input | Serial interface shift clock |
12 | DIN | DIN | Digital Input | Serial interface data input |
13 | DRDY | DRDY | Digital output | Data ready indicator, active low |
14 | DOUT/DRDY | DOUT/DRDY | Digital output | Dual function serial interface data output and active-low data ready indicator |
15 | BYPASS | BYPASS | Analog output | Internal subregulator bypass; connect a 1-µF capacitor to DGND |
16 | DGND | DGND | Digital | Digital ground |
17 | DVDD | DVDD | Digital | Digital power supply |
18 | CLKIN | CLKIN | Digital input | 1) Internal oscillator: connect to DGND
2) External clock: connect clock input |
19-22 | NC | NC | — | No connection. Electrically float or connect to DGND |
23 | NC | AIN9 | Analog
input/output |
ADS1260-Q1: No connection. Electrically float or connect to DGND
ADS1261-Q1: Analog input 9, IDAC1, IDAC2 |
24 | NC | AIN8 | Analog
input/output |
ADS1260-Q1: No connection. Electrically float or connect to DGND
ADS1261-Q1: Analog input 8, IDAC1, IDAC2 |
25 | NC | AIN7 | Analog
input/output |
ADS1260-Q1: No connection. Electrically float or connect to DGND
ADS1261-Q1: Analog input 7, IDAC1, IDAC2 |
26 | NC | AIN6 | Analog
input/output |
ADS1260-Q1: No connection. Electrically float or connect to DGND
ADS1261-Q1: Analog input 6, IDAC1, IDAC2 |
27 | NC | AIN5 | Analog
input/output |
ADS1260-Q1: No connection. Electrically float or connect to DGND
ADS1261-Q1: Analog input 5, IDAC1, IDAC2, GPIO3, ACX2 |
28 | AIN4 | AIN4 | Analog
input/output |
ADS1260-Q1: Analog input 4, IDAC1, IDAC2
ADS1261-Q1: Analog input 4, IDAC1, IDAC2, GPIO2, ACX1 |
29 | AIN3 | AIN3 | Analog
input/output |
ADS1260-Q1: Analog input 3, IDAC1, IDAC2
ADS1261-Q1: Analog input 3, IDAC1, IDAC2, REFN1, GPIO1, ACX2 |
30 | AIN2 | AIN2 | Analog
input/output |
ADS1260-Q1: Analog input 2, IDAC1, IDAC2
ADS1261-Q1: Analog input 2, IDAC1, IDAC2, REFP1, GPIO0, ACX1 |
31 | AIN1 | AIN1 | Analog
input/output |
Analog input 1, IDAC1, IDAC2, REFN0 |
32 | AIN0 | AIN0 | Analog
input/output |
Analog input 0, IDAC1, IDAC2, REFP0 |
Thermal Pad | Pad | Pad | — | Exposed thermal pad; Connect to AVSS. Pad must be soldered for mechanical integrity. |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Power-supply voltage | AVDD to AVSS | –0.3 | 7 | V |
AVSS to DGND | –3 | 0.3 | ||
DVDD to DGND | –0.3 | 7 | ||
Analog input voltage | AINx | AVSS – 0.3 | AVDD + 0.3 | V |
Digital input voltage | CS, SCLK, DIN, DOUT/DRDY, DRDY, START, RESET, PWDN, CLKIN | DGND – 0.3 | DVDD + 0.3 | V |
Input current | Continuous, all pins except power-supply pins(2) | –10 | 10 | mA |
Temperature | Junction, TJ | 150 | °C | |
Storage, Tstg | –60 | 150 | °C |
VALUE | UNIT | ||||
---|---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per AEC Q100-002(1)
HBM ESD Classification Level 2 |
±2000 | V | |
Charged-device model (CDM), per AEC Q100-011
CDM ESD Classification Level C4B |
Corner Pins | ±750 | |||
All other Non-Corner Pins | ±500 |
MIN | NOM | MAX | UNIT | |||
---|---|---|---|---|---|---|
POWER SUPPLY | ||||||
Analog power supply | AVDD to AVSS | 4.75 | 5 | 5.25 | V | |
AVSS to DGND | –2.6 | 0 | ||||
Digital power supply | DVDD to DGND | 2.7 | 5.25 | V | ||
ANALOG INPUTS | ||||||
V(AINx) | Absolute input voltage | PGA mode | See Equation 5 | V | ||
PGA bypassed | AVSS – 0.1 | AVDD + 0.1 | ||||
VIN | Differential input voltage | VIN = VAINp – VAINn | ±VREF / Gain | See (1) | V | |
VOLTAGE REFERENCE INPUTS | ||||||
VREF | Differential reference voltage | VREF = V(REFPx) – V(REFNx) | 0.9 | AVDD – AVSS | V | |
V(REFNx) | Negative reference voltage | AVSS – 0.05 | V(REFPx) – 0.9 | V | ||
V(REFPx) | Positive reference voltage | V(REFNx) + 0.9 | AVDD + 0.05 | V | ||
EXTERNAL CLOCK | ||||||
fCLK | Frequency | 2.5 SPS to 25.6 kSPS | 1 | 7.3728 | 8 | MHz |
40 kSPS | 1 | 10.24 | 10.75 | |||
Duty cycle | 40% | 60% | ||||
GENERAL-PURPOSE INPUTS/OUTPUTS (GPIOs) | ||||||
Input voltage | AVSS | AVDD | V | |||
DIGITAL INPUTS (Other Than GPIOs) | ||||||
Input voltage | DGND | DVDD | V | |||
TEMPERATURE | ||||||
TA | Operating ambient temperature | –40 | 125 | °C |
THERMAL METRIC(1) | ADS126x-Q1 | UNIT | |
---|---|---|---|
RHM (VQFN) | |||
32 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 29.2 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 17.6 | °C/W |
RθJB | Junction-to-board thermal resistance | 9.8 | °C/W |
ψJT | Junction-to-top characterization parameter | 0.2 | °C/W |
ψJB | Junction-to-board characterization parameter | 9.7 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 1.1 | °C/W |