Product Brief
1 6 - C h a n n e l , 1 M s ps , 1 2 - B i t A D C w i t h S e q u e n c e r
1 General Description
2 Key Features
The AS1542 is a 12-bit high-speed, low-power, 16-channel, successive-approximation ADC that operates from
a single 2.7 to 5.25V supply. The device features high
throughput rates (1Msps) and a low-noise, wide-bandwidth track-and-hold amplifier that can handle input frequencies in excess of 1 MHz.
Single Supply Operation with VDRIVE Function:
2.7 to 5.25V
Fast Throughput Rate: 1 Msps
Sequencer & Channel Counter
The AS1542 features 16 single-ended or 8 fully differential analog inputs with a channel sequencer to allow a
programmed selection of channels to be converted
sequentially. The conversion time is determined by the
SCLK frequency (also used as the master clock to control the conversion).
Software-Configurable Analog Input Types:
- 16-Channel Single-Ended
- 8-Channel Fully-Differential
Software-Configurable Input Range
The conversion process and data acquisition are controlled using a chip select pin and a serial clock signal,
allowing the device to easily interface with microprocessors or DSPs. The input signal is sampled on the falling
edge of CSN and conversion is also initiated at this
point. There are no pipeline delays associated with the
The AS1542 uses advanced design techniques to
achieve very low power dissipation at high throughput
rates. At maximum throughput rates, the AS1542 consumes just 2.8mA (@3.6V), and 3.5mA (@5.25V).
By using internal control register, single-ended or fullydifferential conversion mode with different input ranges
can be used with either straight binary or twos complement output coding.
The device is available in a TSSOP-28 pin package.
Low Power Consumption at Max Throughput Rates:
- 10.1mW @ 1Msps (3.6V Supply)
- 18.4mW @ 1Msps (5.25V Supply)
Shutdown Mode Current: 0.5µA
Flexible Power/Serial Clock Speed Management
Wide Input Bandwidth: 71dB SNR @ 50 kHz Input
No Pipeline Delays
High Speed SPI/QSPI/Microwire/DSP Interface
TSSOP-28 Package
3 Applications
The devices are ideal for remote sensors, data-acquisition and data-logging devices, pen-digitizers, process
control, or any other space-limited A/D application with
low power-consumption requirements.
Figure 1. Typical Application
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Product Brief
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Revision 1.00