16-Channel, 1 MSPS, 12-Bit ADC
with Sequencer in 28-Lead TSSOP
Fast throughput rate: 1 MSPS
Specified for VDD of 2.7 V to 5.25 V
Low power at maximum throughput rates
5.4 mW maximum at 870 kSPS with 3 V supplies
12.5 mW maximum at 1 MSPS with 5 V supplies
16 (single-ended) inputs with sequencer
Wide input bandwidth
69.5 dB SNR at 50 kHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface, SPI/QSPI™/MICROWIRE™/
Full shutdown mode: 0.5 µA maximum
28-lead TSSOP and 32-lead LFCSP packages
The AD7490 is a 12-bit high speed, low power, 16-channel,
successive approximation ADC. The part operates from a single
2.7 V to 5.25 V power supply and features throughput rates up
to 1 MSPS. The part contains a low noise, wide bandwidth
track-and-hold amplifier that can handle input frequencies in
excess of 1 MHz.
The conversion process and data acquisition are controlled
using CS and the serial clock signal, allowing the device to
easily interface with microprocessors or DSPs. The input signal
is sampled on the falling edge of CS, and conversion is also
initiated at this point. There are no pipeline delays associated
with the part.
The AD7490 uses advanced design techniques to achieve very
low power dissipation at high throughput rates. For maximum
throughput rates, the AD7490 consumes just 1.8 mA with 3 V
supplies, and 2.5 mA with 5 V supplies.
By setting the relevant bits in the control register, the analog
input range for the part can be selected to be a 0 V to REFIN
input or a 0 V to 2 × REFIN input, with either straight binary
or twos complement output coding. The AD7490 features 16
single-ended analog inputs with a channel sequencer to allow a
preprogrammed selection of channels to be converted sequen-
tially. The conversion time is determined by the SCLK
FUNCTIONAL BLOCK DIAGRAM
frequency because this is also used as the master clock to
control the conversion.
The AD7490 is available in a 32-lead LFCSP and a 28-lead
1. The AD7490 offers up to 1 MSPS throughput rates. At
maximum throughput with 3 V supplies, the AD7490
dissipates just 5.4 mW of power.
2. A sequence of channels can be selected, through which the
AD7490 cycles and converts.
3. The AD7490 operates from a single 2.7 V to 5.25 V supply.
The VDRIVE function allows the serial interface to connect
directly to either 3 V or 5 V processor systems independent
4. The conversion rate is determined by the serial clock,
allowing the conversion time to be reduced through the
serial clock speed increase. The part also features various
shutdown modes to maximize power efficiency at lower
throughput rates. Power consumption is 0.5 µA, maximum,
when in full shutdown.
5. The part features a standard successive approximation
ADC with accurate control of the sampling instant via a CS
input and once off conversion control.
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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