AD7918:  8-Channel, 1 MSPS, 10-Bit ADC with Sequencer in 20-Lead TSSOP

The AD7908/AD7918/AD7928 are, respectively, 8-bit, 10-bit, and 12-bit, high speed, low power, 8-channel, successive approximation ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and ...More

AD7918:  8-Channel, 1 MSPS, 10-Bit ADC with Sequencer in 20-Lead TSSOP

Product Description

The AD7908/AD7918/AD7928 are, respectively, 8-bit, 10-bit, and 12-bit, high speed, low power, 8-channel, successive approximation ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1 MSPS. The parts contain a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 8 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 AD7908/AD7918/AD7928 use advanced design techniques to achieve very low power dissipation at maximum throughput rates. At maximum throughput rates, the AD7908/AD7918/AD7928 consume 2 mA maximum with 3 V supplies; with 5 V supplies, the current consumption is 2.7 mA maximum.

Through the configuration of the control register, the analog input range for the part can be selected as 0 V to REFIN or 0 V to 2 × REFIN, with either straight binary or twos complement output coding. The AD7908/AD7918/AD7928 each feature eight single-ended analog inputs with a channel sequencer to allow a preprogrammed selection of channels to be converted sequentially.

The conversion time for the AD7908/AD7918/AD7928 is determined by the SCLK frequency, which is also used as the master clock to control the conversion.

Product Highlights

  1. High Throughput with Low Power Consumption. The AD7908/ AD7918/AD7928 offer up to 1 MSPS throughput rates. At the maximum throughput rate with 3 V supplies, the AD7908/ AD7918/AD7928 dissipate just 6 mW of power maximum.
  2. Eight Single-Ended Inputs with a Channel Sequencer. A sequence of channels can be selected, through which the ADC cycles and converts on.
  3. Single-Supply Operation with VDRIVE Function. The AD7908/ AD7918/AD7928 operate 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 of AVDD.
  4. Flexible Power/Serial Clock Speed Management. The conversion rate is determined by the serial clock, allowing the conversion time to be reduced through the serial clock speed increase. The parts also feature various shutdown modes to maximize power efficiency at lower throughput rates. Current consumption is 0.5 μA max when in full shutdown.
  5. 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.

Features

  • Fast throughput rate: 1 MSPS
  • Specified for AVDD of 2.7 V to 5.25 V
  • Low Power:
    6.0 mW max at 1 MSPS with 3 V supply
    13.5 mW max at 1 MSPS with 5 V supply
  • Eight (single-ended) inputs with sequencer
  • Wide input bandwidth: AD7928, 70 dB min SINAD at 50 kHz input frequency
  • Flexible power/serial clock speed management
  • No pipeline delays
  • High speed serial interface SPI®/QSPI™/MICROWIRE™/DSP compatible

Diagrams

AD7918 Diagram
Functional Block Diagram for AD7918

Specifications

Resolution (Bits) 10bit
T-Put Rate 1MSPS
# Chan 8
Supply V Single(+3),Single(+3.3),Single(+5)
Pwr Diss 13.5mW
Interface Ser,SPI
Ain Range Uni (Vref),Uni (Vref) x 2
SNR (dB) 61dB
Pkg Type SOP

AD7192 - 4.8 kHz Ultra-Low Noise 24-Bit Sigma-Delta ADC with PGA

AD7781 - 20-Bit, Pin-Programmable, Ultralow Power Sigma-Delta ADC

AD7357 - Differential Input, Dual, Simultaneous Sampling, 4.25 MSPS, 14-Bit, SAR ADC

AD7949 - 14-Bit, 8-Channel, 250 kSPS PulSAR® ADC

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Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
AD7918 10 1MSPS 8 13.5mW
AD7928 12 1MSPS 8 13.5mW
AD7914 10 1MSPS 4 13.5mW
AD7441 10 1MSPS 1 9.3mW
AD7440 10 1MSPS 1 9mW
AD7470 10 1.75MSPS 1 12mW
AD7939 10 1.5MSPS 8 16mW
AD9212-40 10 40MSPS 8 560mW
AD9212-65 10 65MSPS 8 833mW
AD7908 8 1MSPS 8 13.5mW
AD7812 10 350KSPS 8 10.5mW
Pricing, Packaging & Availability

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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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