ISL26132_14 Datasheet, PDF (4/23 Pages) Intersil Corporation – Low-Noise 24-bit Delta Sigma ADC

ISL26132, ISL26134
Pin Descriptions (Continued)
NAME
SPEED
PIN NUMBER
ISL26132
ISL26134
21
25
ANALOG/DIGITAL
INPUT/OUTPUT
Digital Input
DESCRIPTION
TABLE 4. DATA RATE SELECT
SPEED
DATA RATE
0
10Sps
1
80Sps
PDWN
22
SCLK
23
SDO/RDY
24
26
Digital Input
27
Digital Input
28
Digital Output
Circuit Description
The ISL26132 (2-channel) and ISL26134 (4-channel) devices are
very low noise 24-bit delta-sigma ADCs that include a
programmable gain amplifier and an input multiplexer. The
ISL26132 offers an on-chip temperature measurement
capability.
The ISL26132, ISL26134 provide pin compatibility and output
data compatibility with the ADS1232/ADS1234, and offer the
same conversion rates of 10Sps and 80Sps.
All the features of the ISL26132, ISL26134 are pin-controllable,
while offset calibration, standby mode, and output conversion
data are accessible through a simple 2-wire interface.
The clock can be selected to come from an internal oscillator, an
external clock signal, or crystal (4.9152MHz typical).
Power-Down: Holding this pin low powers down the entire
converter and resets the ADC.
Serial Clock: Clock out data on the rising edge. Also used to
initiate Offset Calibration and Sleep modes. See “Serial Clock
Input (SCLK)” on page 14 for more details.
Dual-Purpose Output:
Data Ready: Indicate valid data by going low.
Data Output: Outputs data, MSB first, on the first rising edge
of SCLK.
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4
FN6954.3
November 20, 2014