ꢋ ꢑꢉ ꢀꢁ ꢗꢇ
ꢋ ꢑꢉ ꢀꢁ ꢗꢁ
www.ti.com
SBAS274E − MARCH 2003 − REVISED JUNE 2004
PIN ASSIGNMENTS
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
AGND
AVDD
AGND
AINN
1
2
3
4
5
6
7
8
9
48 FIFO_LEV[2] (ADS1606 Only)
ADS1605
ADS1606
47
46
FIFO_LEV[1] (ADS1606 Only)
FIFO_LEV[0] (ADS1606 Only)
45 NC
AINP
44 DOUT[15]
43
42
AGND
AVDD
RBIAS
AGND
DOUT[14]
DOUT[13]
TQFP PACKAGE
(TOP VIEW)
41 DOUT[12]
40 DOUT[11]
39 DOUT[10]
PowerPADTM
AVDD 10
11
12
38
37
AGND
AVDD
DOUT[9]
DOUT[8]
REFEN 13
NC 14
36 DOUT[7]
35 DOUT[6]
15
16
34
33
2XMODE
NC
DOUT[5]
DOUT[4]
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Terminal Functions
TERMINAL
TYPE
DESCRIPTION
NAME
AGND
AVDD
AINN
NO.
1, 3, 6, 9, 11, 55, 57
Analog
Analog
Analog ground
2, 7, 10, 12, 58
Analog supply
4
Analog input
Analog input
Analog
Negative analog input
Positive analog input
AINP
5
RBIAS
REFEN
NC
8
13
Terminal for external analog bias setting resistor
Digital input: active low
Not connected
Internal reference enable. Internal pull-down resistor of 170kΩ to DGND.
14,16, 27, 28, 45, 50
These terminals are not connected within the ADS1605/6 and must be left
unconnected.
2XMODE
PD
15
Digital input
Digital input: active low
Digital
Digital filter decimation rate. Internal pull-down resistor of 170kΩ to DGND.
17
18, 26, 52
19, 25, 51, 54
20
Power down all circuitry. Internal pull-up resistor of 170kΩ to DGND.
DVDD
DGND
RESET
CS
Digital supply
Digital
Digital ground
Digital input: active low
Digital input: active low
Digital input: active low
Digital output
Reset digital filter
21
Chip select
RD
22
Read enable
OTR
23
Analog inputs out of range
Data ready on falling edge
Data output. DOUT[15] is the MSB and DOUT[0] is the LSB.
DRDY
DOUT [15:0]
FIFO_LEV[2:0]
24
Digital output: active low
Digital output
29−44
46−48
Digital input
FIFO level (for the ADS1606 only). FIFO_LEV[2] is MSB.
NOTE: These terminals must be left disconnected on the ADS1605.
IOVDD
CLK
53
56
Digital
Digital input
Analog
Digital I/O supply
Clock input
VCAP
VREFN
VMID
59
Terminal for external bypass capacitor connection to internal bias voltage
Negative reference voltage
60, 61
62
Analog
Analog
Midpoint voltage
VREFP
63, 64
Analog
Positive reference voltage
7
BB [ BURR-BROWN CORPORATION ]
