3 MSPS,10-/12-Bit
ADCs in 8-Lead TSOT
AD7273/AD7274
Rev. 0
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FEATURES
Throughput rate: 3 MSPS
Specified for V
DD
of 2.35 V to 3.6 V
Power consumption
11.4 mW at 3 MSPS with 3 V supplies
Wide input bandwidth
70 dB SNR at 1 MHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
Temperature range: −40°C to +125°C
Power-down mode: 0.1 μA typ
8-lead TSOT package
8-lead MSOP package
GENERAL DESCRIPTION
The AD7273/AD7274 are 10-/12-bit, high speed, low power,
successive approximation ADCs, respectively. The parts operate
from a single 2.35 V to 3.6 V power supply and feature
throughput rates of up to 3 MSPS. Each part contains a low
noise, wide bandwidth track-and-hold amplifier that can handle
input frequencies in excess of 55 MHz.
The conversion process and data acquisition are controlled
using
CS
and the serial clock, allowing the devices to interface
with microprocessors or DSPs. The input signal is sampled on
the falling edge of
CS
, and the conversion is also initiated at this
point. The conversion rate is determined by the SCLK. There
are no pipeline delays associated with these parts.
The AD7273/AD7274 use advanced design techniques to
achieve very low power dissipation at high throughput rates.
The reference for the parts is applied externally and can be in
the range of 1.4 V to V
DD
. This allows the widest dynamic input
range to the ADC.
FUNCTIONAL BLOCK DIAGRAM
T/H
CONTROL
LOGIC
10-/12-BIT
SUCCESSIVE
APPROXIMATION
ADC
DGND
V
DD
AD7273/AD7274
V
IN
AGND
SCLK
SDATA
CS
REF
04973-001
Figure 1.
Table 1.
Part Number Resolution Package
AD7273
1
10 8-lead MSOP 8-Lead TSOT
AD7274
1
12 8-lead MSOP 8-Lead TSOT
AD7276 12 8-lead MSOP 6-Lead TSOT
AD7277 10 8-lead MSOP 6-Lead TSOT
AD7278 8 8-lead MSOP 6-Lead TSOT
1
Parts contain external reference pin.
PRODUCT HIGHLIGHTS
1. 3 MSPS ADCs in an 8-lead TSOT package.
2. High throughput with low power consumption.
3. Flexible power/serial clock speed management.
Allows maximum power efficiency at low throughput rates.
4. Reference can be driven up to the power supply.
5. No pipeline delay.
6. The parts feature a standard successive approximation ADC
with accurate control of the sampling instant via a
CS
input
and once-off conversion control.