Datasheet
ADS1299
SBAS499A –JULY 2012–REVISED AUGUST 2012
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PIN ASSIGNMENTS (continued)
NAME TERMINAL FUNCTION DESCRIPTION
DVDD 48, 50 Supply Digital power supply
GPIO1 42 Digital input/output General-purpose input/output pin
GPIO2 44 Digital input/output General-purpose input/output pin
GPIO3 45 Digital input/output GPIO3 in normal mode
GPIO4 46 Digital input/output GPIO4 in normal mode
IN1N
(1)
15 Analog input Differential analog negative input 1
IN1P 16 Analog input Differential analog positive input 1
IN2N 13 Analog input Differential analog negative input 2
IN2P 14 Analog input Differential analog positive input 2
IN3N 11 Analog input Differential analog negative input 3
IN3P 12 Analog input Differential analog positive input 3
IN4N 9 Analog input Differential analog negative input 4
IN4P 10 Analog input Differential analog positive input 4
IN5N 7 Analog input Differential analog negative input 5
IN5P 8 Analog input Differential analog positive input 5
IN6N 5 Analog input Differential analog negative input 6
IN6P 6 Analog input Differential analog positive input 6
IN7N 3 Analog input Differential analog negative input 7
IN7P 4 Analog input Differential analog positive input 7
IN8N 1 Analog input Differential analog negative input 8
IN8P 2 Analog input Differential analog positive input 8
NC 27, 29 — No connection
Reserved 64 Analog output Leave as open circuit
RESET 36 Digital input System reset; active low
RESV1 31 Digital input Reserved for future use. Must tie to logic low (DGND)
SCLK 40 Digital input SPI clock
SRB1 17 Analog input/output Patient stimulus, reference, and bias signal 1
SRB2 18 Analog input/output Patient stimulus, reference, and bias signal 2
START 38 Digital input Start conversion
PWDN 35 Digital input Power-down; active low
VCAP1 28 — Analog bypass capacitor
VCAP2 30 — Analog bypass capacitor
VCAP3 55 Analog Analog bypass capacitor
VCAP4 26 Analog output Analog bypass capacitor
VREFN 25 Analog input Negative reference voltage
VREFP 24 Analog input/output Positive reference voltage
(1) Connect unused analog inputs IN1x to IN8x to AVDD.
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