ADS1218_14 Datasheet, PDF (8/45 Pages) Texas Instruments – 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER with FLASH Memory

ADS1218
SBAS187C – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
PIN CONFIGURATION
Top View
36 35 34 33 32 31 30 29 28 27 26 25
D0 37
D1 38
D2 39
D3 40
D4 41
D5 42
D6 43
D7 44
AGND 45
V_REFOUT 46
V_REF+ 47
V_REF− 48
123
ADS1218
45678
9 10 11 12
24 RESET
23 BUFEN
22 DGND
21 DGND
20 DGND
19 DGND
18 WREN
17 R_DAC
16 IDAC2
15 IDAC1
14 V_RCAP
13 AV_DD
www.ti.com
TQFP
PIN DESCRIPTIONS
PIN
NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19–22
23
NAME
AV_DD
AGND
A_IN0
A_IN1
A_IN2
A_IN3
A_IN4
A_IN5
A_IN6
A_IN7
A_INCOM
AGND
AV_DD
V_RCAP
IDAC1
IDAC2
R_DAC
WREN
DGND
BUFEN
DESCRIPTION
Analog Power Supply
Analog Ground
Analog Input 0
Analog Input 1
Analog Input 2
Analog Input 3
Analog Input 4
Analog Input 5
Analog Input 6
Analog Input 7
Analog Input Common
Analog Ground
Analog Power Supply
V_REF Bypass CAP
Current DAC1 Output
Current DAC2 Output
Current DAC Resistor
Active High, Flash Write Enable
Digital Ground
Buffer Enable
PIN
NUMBER
24
25
26
27
28
29
30
31
32
33
34
35
36
37–44
45
46
47
48
NAME
RESET
X_IN
X_OUT
PDWN
POL
DSYNC
DGND
DV_DD
DRDY
CS
SCLK
D_IN
D_OUT
D0-D7
AGND
V_REFOUT
V_REF+
V_REF–
DESCRIPTION
Active Low, resets the entire chip.
Clock Input
Clock Output, used with crystal or resonator.
Active Low. Power Down. The power-down
function shuts down the analog and digital
circuits.
Serial Clock Polarity
Active Low, Synchronization Control
Digital Ground
Digital Power Supply
Active Low, Data Ready
Active Low, Chip Select
Serial Clock, Schmitt Trigger
Serial Data Input, Schmitt Trigger
Serial Data Output
Digital I/O 0–7
Analog Ground
Voltage Reference Output
Positive Differential Reference Input
Negative Differential Reference Input
8