ADS1291_14 Datasheet, PDF (12/75 Pages) Texas Instruments – Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements

ADS1291
ADS1292
ADS1292R
SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012
www.ti.com
NAME
AVDD
AVSS
CLK
CLKSEL
CS
DGND
DIN
DOUT
DRDY
DVDD
GPIO1/RCLK1
GPIO2/RCLK2
IN1N ⁽¹⁾
IN1P ⁽¹⁾
IN2N ⁽¹⁾
IN2P ⁽¹⁾
PGA1N
PGA1P
PGA2N
PGA2P
PWDN/RESET
RESP_MODN/IN3N ⁽¹⁾
RESP_MODP/IN3P ⁽¹⁾
TERMINAL
12
13
17
14
18
24
19
21
22
23
26
25
3
4
5
6
1
2
7
8
15
32
31
RLDIN/RLDREF
29
RLDINV
28
RLDOUT
30
SCLK
20
START
16
VCAP1
11
VCAP2
27
VREFN
10
VREFP
9
PIN ASSIGNMENTS
FUNCTION
DESCRIPTION
Supply
Analog supply
Supply
Analog ground
Digital input
Master clock input
Digital input
Master clock select
Digital input
Chip select
Supply
Digital ground
Digital input
SPI data in
Digital output
SPI data out
Digital output
Data ready; active low
Supply
Digital power supply
Digital input/output General-purpose I/O 1 or resp clock 1 (ADS1292R)
Digital input/output General-purpose I/O 2 or resp clock 2 (ADS1292R)
Analog input
Differential analog negative input 1
Analog input
Differential analog positive input 1
Analog input
Differential analog negative input 2
Analog input
Differential analog positive input 2
Analog output
PGA1 inverting output
Analog output
PGA1 noninverting output
Analog output
PGA2 inverting output
Analog output
PGA2 noninverting output
Digital input
Power-down or system reset; active low
Analog input/output N-side respiration excitation signal for respiration or auxiliary input 3N
Analog input/output P-side respiration excitation signal for respiration or auxiliary input 3P
Analog input
Right leg drive input to MUX or RLD amplifier noninverting input; connect
to AVDD if not used
Analog input
Right leg drive inverting input; connect to AVDD if not used
Analog input
Right leg drive output
Digital input
SPI clock
Digital input
Start conversion
—
Analog bypass capacitor
—
Analog bypass capacitor
Analog input
Negative reference voltage; must be connected to AVSS
Analog input/output Positive reference voltage
(1) Connect unused analog inputs to AVDD.
12
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