Refer to the PDF data sheet for device specific package drawings
The ADS79xx is a 12-, 10-, 8-bit pin compatible multichannel analog-to-digital converter family. The device comparison table shows all twelve devices from this product family.
The devices include a capacitor based SAR A/D converter with inherent sample and hold.
The devices accept a wide analog supply range from 2.7 V to 5.25 V. Very low power consumption makes these devices suitable for battery-powered and isolated power-supply applications.
A wide 1.7-V to 5.25-V I/O supply range facilitates a glueless interface with the most commonly used digital hosts. The serial interface is controlled by CS and SCLK for easy connection with microprocessors and DSP.
The input signal is sampled with the falling edge of CS. It uses SCLK for conversion, serial data output, and reading serial data in. The devices allow auto sequencing of preselected channels or manual selection of a channel for the next conversion cycle.
There are two software selectable input ranges (0 V to VREF and 0 V to 2 × VREF), individually configurable GPIOs (four in case of the TSSOP and one on the VQFN package devices), and two programmable alarm thresholds per channel. These features make the devices suitable for most data acquisition applications.
The devices offer an attractive power-down feature. This is extremely useful for power saving when the device is operated at lower conversion speeds.
The 16-, 12-channel devices from this family are available in a 38-pin TSSOP and 32 pin VQFN package and the 4/8-channel devices are available in a 30-pin TSSOP and 24 pin VQFN packages.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
ADS79xx | TSSOP (30) | 7.80 mm × 4.40 mm |
VQFN (24) | 4.00 mm × 4.00 mm | |
TSSOP (38) | 9.70 mm × 4.40 mm | |
VQFN (32) | 5.00 mm × 5.00 mm |
Changes from B Revision (July 2015) to C Revision
Changes from A Revision (April 2010) to B Revision
Changes from * Revision (June 2008) to A Revision
PIN | I/O | DESCRIPTION | |||||
---|---|---|---|---|---|---|---|
NAME | ADS7953
ADS7957 ADS7961 |
ADS7952
ADS7956 ADS7960 |
ADS7951
ADS7955 ADS7959 |
ADS7950
ADS7954 ADS7958 |
|||
REFERENCE | |||||||
REFP | 4 | 4 | 4 | 4 | Analog input | Reference input | |
REFM | 3 | 3 | 3 | 3 | Analog input | Reference ground | |
ADC ANALOG INPUT | |||||||
AINP | 8 | 8 | 8 | 8 | Analog input | ADC input signal | |
AINM | 9 | 9 | 9 | 9 | Analog input | ADC input ground | |
MULTIPLEXER | |||||||
MXO | 7 | 7 | 7 | 7 | Analog output | Multiplexer output | |
Ch0 | 28 | 28 | 20 | 20 | Analog input | Analog channel for multiplexer | |
Ch1 | 27 | 27 | 19 | 18 | Analog input | Analog channel for multiplexer | |
Ch2 | 26 | 26 | 18 | 14 | Analog input | Analog channel for multiplexer | |
Ch3 | 25 | 25 | 17 | 12 | Analog input | Analog channel for multiplexer | |
Ch4 | 24 | 24 | 14 | — | Analog input | Analog channel for multiplexer | |
Ch5 | 23 | 23 | 13 | — | Analog input | Analog channel for multiplexer | |
Ch6 | 22 | 22 | 12 | — | Analog input | Analog channel for multiplexer | |
Ch7 | 21 | 21 | 11 | — | Analog input | Analog channel for multiplexer | |
Ch8 | 18 | 18 | — | — | Analog input | Analog channel for multiplexer | |
Ch9 | 17 | 17 | — | — | Analog input | Analog channel for multiplexer | |
Ch10 | 16 | 16 | — | — | Analog input | Analog channel for multiplexer | |
Ch11 | 15 | 15 | — | — | Analog input | Analog channel for multiplexer | |
Ch12 | 14 | — | — | — | Analog input | Analog channel for multiplexer | |
Ch13 | 13 | — | — | — | Analog input | Analog channel for multiplexer | |
Ch14 | 12 | — | — | — | Analog input | Analog channel for multiplexer | |
Ch15 | 11 | — | — | — | Analog input | Analog channel for multiplexer | |
DIGITAL CONTROL SIGNALS | |||||||
CS | 31 | 31 | 23 | 23 | Digital input | Chip-select input pin; active low | |
SCLK | 32 | 32 | 24 | 24 | Digital input | Serial clock input pin | |
SDI | 33 | 33 | 25 | 25 | Digital input | Serial data input pin | |
SDO | 34 | 34 | 26 | 26 | Digital output | Serial data output pin | |
GENERAL-PURPOSE INPUTS/OUTPUTS(1) | |||||||
GPIO0 | 37 | 37 | 29 | 29 | Digital I/O | General-purpose input or output | |
Alarm | Digital output | Active high alarm output. For configuration, see the Programming section. | |||||
GPIO1 | 38 | 38 | 30 | 30 | Digital I/O | General-purpose input or output | |
Low alarm | Digital output | Active high output indicating low alarm | |||||
GPIO2 | 1 | 1 | 1 | 1 | Digital I/O | General-purpose input or output | |
Range | Digital input | Selects ADC input range: High (1) -> Range 2 (0 to 2xVREF) / Low (0) -> Range 1 (0 to VREF) | |||||
GPIO3 | 2 | 2 | 2 | 2 | Digital I/O | General-purpose input or output | |
PD | Digital input | Active low power-down input | |||||
POWER SUPPLY AND GROUND | |||||||
+VA | 5, 29 | 5, 29 | 5, 21 | 5, 21 | — | Analog power supply | |
AGND | 6, 10, 19, 20, 30 | 6, 10, 19, 20, 30 | 6, 10, 22 | 6, 10, 22 | — | Analog ground | |
+VBD | 36 | 36 | 28 | 28 | — | Digital I/O supply | |
BDGND | 35 | 35 | 27 | 27 | — | Digital ground | |
NC PINS | |||||||
— | — | 11, 12, 13, 14 | 15, 16 | 11, 13, 15, 16, 17, 19 | — | Pins internally not connected, do not float these pins, connect these pins to ground |
PIN | I/O | DESCRIPTION | |||||
---|---|---|---|---|---|---|---|
PIN NAME | ADS7953
ADS7957 ADS7961 |
ADS7952
ADS7956 ADS7960 |
ADS7951
ADS7955 ADS7959 |
ADS7950
ADS7954 ADS7958 |
|||
REFERENCE | |||||||
REFP | 31 | 31 | 24 | 24 | Analog input | Reference input | |
REFM | 30 | 30 | 23 | 23 | Analog input | Reference ground | |
ADC ANALOG INPUT | |||||||
AINP | 3 | 3 | 4 | 4 | Analog input | ADC input signal | |
AINM | 4 | 4 | 5 | 5 | Analog input | ADC input ground | |
MULTIPLEXER | |||||||
MXO | 2 | 2 | 3 | 3 | Analog output | Multiplexer output | |
Ch0 | 20 | 18 | 13 | 11 | Analog input | Analog-input channel for multiplexer | |
Ch1 | 19 | 17 | 12 | 10 | Analog input | Analog-input channel for multiplexer | |
Ch2 | 18 | 16 | 11 | 9 | Analog input | Analog-input channel for multiplexer | |
Ch3 | 17 | 15 | 10 | 8 | Analog input | Analog-input channel for multiplexer | |
Ch4 | 16 | 14 | 9 | — | Analog input | Analog-input channel for multiplexer | |
Ch5 | 15 | 13 | 8 | — | Analog input | Analog-input channel for multiplexer | |
Ch6 | 14 | 12 | 7 | — | Analog input | Analog-input channel for multiplexer | |
Ch7 | 13 | 11 | 6 | — | Analog input | Analog-input channel for multiplexer | |
Ch8 | 12 | 10 | — | — | Analog input | Analog-input channel for multiplexer | |
Ch9 | 11 | 9 | — | — | Analog input | Analog-input channel for multiplexer | |
Ch10 | 10 | 8 | — | — | Analog input | Analog-input channel for multiplexer | |
Ch11 | 9 | 7 | — | — | Analog input | Analog-input channel for multiplexer | |
Ch12 | 8 | — | — | — | Analog input | Analog-input channel for multiplexer | |
Ch13 | 7 | — | — | — | Analog input | Analog-input channel for multiplexer | |
Ch14 | 6 | — | — | — | Analog input | Analog-input channel for multiplexer | |
Ch15 | 5 | — | — | — | Analog input | Analog-input channel for multiplexer | |
DIGITAL CONTROL SIGNALS | |||||||
CS | 23 | 23 | 16 | 16 | Digital input | Chip-select input pin; active low | |
SCLK | 24 | 24 | 17 | 17 | Digital input | Serial clock input pin | |
SDI | 25 | 25 | 18 | 18 | Digital input | Serial data input pin | |
SDO | 26 | 26 | 19 | 19 | Digital output | Serial data output pin | |
GENERAL-PURPOSE INPUT/OUTPUT(1) | |||||||
GPIO0 | 29 | 29 | 22 | 22 | Digital I/O | General purpose input or output | |
Alarm | Digital output | Active high alarm output. For configuration, see the Programming section. | |||||
POWER SUPPLY AND GROUND | |||||||
+VA | 21, 32 | 21, 32 | 1, 14 | 1, 14 | — | Analog power supply | |
AGND | 1, 22 | 1, 22 | 2, 15 | 2, 15 | — | Analog ground | |
+VBD | 28 | 28 | 21 | 21 | — | Digital I/O supply | |
BDGND | 27 | 27 | 20 | 20 | — | Digital ground | |
NC PINS | |||||||
— | — | 5, 6, 19, 20 | — | 6, 7, 12, 13 | — | Pins internally not connected, do not float these pins, connect these pins to ground |