AD7921
PRODUCTION2-Channel, 2.35 V to 5.25 V, 250 kSPS, 12-Bit A/D Converter
- Part Models
- 3
- 1ku List Price
- Starting From $3.10
Part Details
- Specified for VDD of 2.35 V to 5.25 V
- Low Power:
4 mW typ at 250 kSPS with 3 V Supplies
13.5 mW typ at 250 kSPS with 5 V Supplies - Wide Input Bandwidth:
71.5 dB Minimum SNR at 100 kHz Input Frequency - Flexible Power/Serial Clock Speed Management
- Throughput Rate: 250 kSPS
- No Pipeline Delays
- High Speed Serial Interface SPI®/QSPI™/MICROWIRE™/DSP Compatible
- Standby Mode: 1 µA max
- 8-Lead TSOT Package
- 8-Lead MSOP Package
The AD7911 / AD7921 are 10-bit and 12-bit, high speed, low power, 2-channel, successive-approximation ADCs respectively. The parts operate from a single 2.35 V to 5.25 V power supply and feature throughput rates up to 250 kSPS. The parts contain a low-noise, wide bandwidth track/hold amplifier, which can handle input frequencies in excess of 6 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. There are no pipeline delays associated with the part.
The channel to be converted is selected through the DIN pin and the mode of operation is controlled by CS. The serial data stream from the DOUT pin has a channel identifier bit, which provides information about the channel converted.
The AD7911 / AD7921 use advanced design techniques to achieve very low power dissipation at high throughput rates.
The reference for the part is taken internally from VDD, thereby allowing the widest dynamic input range to the ADC. The analog input range for the part, therefore, is 0 to VDD. The conversion rate is determined by the SCLK signal.
PRODUCT HIGHLIGHTS
- 2-channel, 250 kSPS, 10-/12-bit ADCs in TSOT package.
- Low power consumption.
- Flexible power/serial clock speed management.
The conversion rate is determined by the serial clock; conversion time is reduced when the serial clock speed is increased. The parts also feature a power-down mode to maximize power efficiency at lower throughput rates. Average power consumption is reduced when the power-down mode is used while not converting. Current consumption is 1 μA maximum and 50 nA typically when in power-down mode. - Reference derived from the power supply.
- No pipeline delay.
The parts feature a standard successive approximation ADC with accurate control of the sampling instant via a CS input and once-off conversion control.
APPLICATIONS
- Battery-powered systems:
Personal digital assistants
Medical instruments
Mobile communications - Instrumentation and control systems
- Data acquisition systems
- High speed modems
- Optical sensors
Documentation
Data Sheet 1
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7921ARMZ | 8-Lead MSOP | ||
| AD7921ARMZ-REEL7 | 8-Lead MSOP | ||
| AD7921AUJZ-REEL7 | 8-Lead TSOT |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Mar 22, 2021 - 21_0001 Addition of Amkor Philippines as an Alternate Site for Singulated MSOP and MSOP_EP |
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| AD7921ARMZ | PRODUCTION | |
| AD7921ARMZ-REEL7 | PRODUCTION | |
|
Jan 5, 2015 - 14_0246 Qualification of ASE Chungli, as an Alternate Assembly Site for Select MSOP Devices |
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| AD7921ARMZ | PRODUCTION | |
| AD7921ARMZ-REEL7 | PRODUCTION | |
|
May 15, 2012 - 10_0006 Halogen Free Material Change for mini SOIC Products |
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| AD7921ARMZ | PRODUCTION | |
| AD7921ARMZ-REEL7 | PRODUCTION | |
|
Feb 8, 2010 - 04_0080 Qualification of the 8" C6 and Q Wafer Fab Processes at Analog Devices, Limerick, Ireland. |
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| AD7921ARMZ | PRODUCTION | |
| AD7921ARMZ-REEL7 | PRODUCTION | |
| AD7921AUJZ-REEL7 | PRODUCTION | |
|
Apr 16, 2018 - 16_0288 CANCELLED: Addition of Amkor Philippines as Alternate Assembly Site for 6L and 8L TSOT Chip-On-Lead Packages |
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| AD7921AUJZ-REEL7 | PRODUCTION | |
|
Jan 26, 2010 - 10_0007 Halogen Free Material Change for TSOT Products |
||
| AD7921AUJZ-REEL7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| High Voltage Op Amps ≥12V 1 | ||
| AD8022 | PRODUCTION | Dual High Speed, Low Noise Op Amp |
| Low Input Bias Current Op Amps (≤100 pA) 2 | ||
| AD8512 | PRODUCTION |
Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Dual Operational Amplifier |
| AD8510 | PRODUCTION |
Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Single Operational Amplifier |
| Low Power Op Amps (≤ 1mA/amp) 2 | ||
| AD8039 | PRODUCTION | Low Power, 350 MHz Voltage Feedback Amplifiers |
| AD8038 | PRODUCTION | Low Power, 350 MHz Voltage Feedback Amplifiers |
| Precision Op Amps (Vos ≤1mV & TCVos ≤2uV/C) 1 | ||
| AD8021 | PRODUCTION | Low Noise, High Speed Amplifier for 16-Bit Systems |
| Series Voltage References 5 | ||
| REF193 | PRODUCTION | 3.0V Precision Micropower, Low Dropout, Low Voltage Reference |
| ADR433 | PRODUCTION | Ultralow Noise XFET® 3.0V Voltage Reference w/Current Sink and Source Capability |
| REF192 | PRODUCTION | 2.5V Precision Micropower, Low Dropout, Low Voltage Reference |
| ADR421 | PRODUCTION | Ultraprecision, Low Noise, 2.500 V XFET® Voltage References |
| REF195 | PRODUCTION | 5.0V Precision Micropower, Low Dropout, Low Voltage Reference |
| Parts | Product Life Cycle | Description |
|---|---|---|
| AD7091R-2 | PRODUCTION | 2-Channel, 1 MSPS, Ultralow Power, 12-Bit ADC in 16-Lead TSSOP |