ADS1232
ADS1234
www.ti.com
SBAS350–JUNE 2005
DEVICE INFORMATION (continued)
PIN DESCRIPTIONS
TERMINAL
ANALOG/DIGITAL
NAME
DVDD
DGND
ADS1232 ADS1234
INPUT/OUTPUT
DESCRIPTION
1
2
1
2
Digital
Digital Power Supply: 2.7V to 5.3V
Digital Ground
Digital
XTAL1/
CLKIN
External Clock Input: Typically 4.9152MHz. Ties low to activate Internal Oscillator. Can also use
external Crystal Oscillator across XTAL1/CLKIN and XTAL2 pins. See text for more details.
3
3
Digital/Digital Input
XTAL2
DGND
DGND
TEMP
A1
4
5
6
7
–
8
4
5
6
–
7
8
Digital
Digital
External Clock Output pin. See text for more details.
Digital Ground
Digital
Digital Ground
Digital Input
Digital Input
Digital Input
Onboard Temperature Diode Enable Input pin
Input Mux Select Input pin (MSB)
Input Mux Select Input pin (LSB):
A0
A1
0
A0
0
Channel
AIN1
0
1
AIN2
1
0
AIN3
1
1
AIN4
CAP
9
9
Analog
Gain Amp Bypass Capacitor Connection
Gain Amp Bypass Capacitor Connection
Positive Analog Input Channel 1
Negative Analog Input Channel 1
Positive Analog Input Channel 3
Negative Analog Input Channel 3
Negative Analog Input Channel 4
Positive Analog Input Channel 4
Negative Analog Input Channel 2
Positive Analog Input Channel 2
Negative Reference Input pin
Positive Reference Input pin
CAP
10
11
12
–
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Analog
AINP1
AINN1
AINP3
AINN3
AINN4
AINP4
AINN2
AINP2
REFN
REFP
AGND
AVDD
GAIN0
GAIN1
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Analog
–
–
–
13
14
15
16
17
18
19
20
Analog Ground
Analog
Analog Power Supply, 2.7V to 5.3V
Gain Select Input pin (LSB)
Digital Input
Digital Input
Gain Select Input pin (MSB):
GAIN1 GAIN0
PGA
1
0
0
1
1
0
1
0
1
2
64
128
SPEED
21
25
Digital Input
Output Data Rate Select Input pin:
SPEED
DATA RATE
10Hz
0
1
80Hz
Power Down Input pin: Holding this pin low powers down the entire converter and resets the A/D
converter.
PDWN
SCLK
22
23
24
26
27
28
Digital Input
Digital Input
Digital Input
Serial Clock Input pin: Clock out data on the rising edge. Used to initiate Offset Calibration and
Sleep modes. See text for more details.
DRDY/
DOUT
Dual-Purpose Output:
Data Ready: Indicates valid data by going low.
Data Output: Outputs data, MSB first, on the first rising edge of SCLK.
6
BB [ BURR-BROWN CORPORATION ]
