Datasheet
AS1536/AS1537
12-Bit, Single Supply, Low-Power, 73ksps A/D Con-
verters
1 General Description
2 Key Features
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12-Bit Resolution with 7.5µs Conversion Time
The AS1536/AS1537 are low-power, 12-bit, 73ksps ana-
log-to-digital (A/D) converters specifically designed for
single-supply A/D applications. Superior AC characteris-
tics, very low power consumption, and robust packaging
make these ultra-small devices perfect for battery-pow-
ered analog-data collection devices.
Sampling Rate: 73ksps
Straight Binary (Unipolar) Data Format
Single-Supply Operation:+2.7V to +5.25V
Internal 2.5V Reference (AS1536)
The integrated successive-approximation register (SAR)
and a fast (1.5µs) sampling track/hold time provide an
economic and highly-reliable A/D conversion solution.
The AS1536/AS1537 operate from a single 2.7V to
5.25V supply. The AS1537 requires an external refer-
ence, using less power than the AS1536, however, the
AS1536 features an internal 2.5V reference.
Low Power-Consumption:
- 4mW (73ksps, AS1536)
- 3mW (73ksps, AS1537)
- 66µW (1ksps, AS1537)
- 1µW (Shutdown Mode)
As with the AS1537, the AS1536 can also be used with
an external reference, which uses the input range 0V to
VREF, including the positive supply range.
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Integrated Track/Hold Amplifier
Internal Clock
The AS1537 consumes only 3mW (VDD = 3V) at the
73ksps maximum sampling speed. Both devices feature
a low-current (0.3µA) shutdown mode, which reduces
power consumption at slower throughput rates.
SPI/QSPI/Microwire 3-Wire Serial Interface
Operating Temperature Range: -40 to +85ºC
8-pin SOIC-150 Package
Data accesses are made via the standard, high-speed
3-wire serial interface, which is SPI-, QSPI-, and
Microwire-compatible. Both devices contain an internal
clock, however, both devices also support an external
clock for increased flexibility.
3 Applications
The devices are ideal for remote sensors, data-acquisi-
tion, data logging devices, lab instruments, or for any
other space-limited A/D devices with low power con-
sumption and single-supply requirements.
The AS1536/AS1537 are available in an 8-pin SOIC-150
package.
Figure 1. Block Diagram
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AS1536/AS1537
VDD
7
Output
Shift
Register
CSN
8
6
DOUT
SCLK
3
Control
Logic
Internal
Clock
SHDNN
Track/
Hold
12-Bit
SAR
2
AIN
2.5V
Ref
5
4
AS1536
only
GND
REF
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