Details, datasheet, quote on part number: AD7939
Description8-Channel, 1.5 Msps, 12-Bit, Parallel ADC With a Sequencer in a 32-LFCSP Package
CompanyAnalog Devices
DatasheetDownload AD7939 datasheet
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Features, Applications

FEATURES Fast Throughput Rate: 1.5 MSPS Specified for VDD 5.25 V Low Power: 8 mW max at 1.5 MSPS with 3V Supplies 16 mW max at 1.5 MSPS with 5V Supplies 8 Analog Input Channels with a Sequencer Software Configurable Analog Inputs: 8-Channel Single Ended Inputs 4-Channel Fully Differential Inputs 4-Channel Pseudo Differential Inputs 7-Channel Pseudo Differential Inputs Accurate On-chip 2.5 V Reference Wide Input Bandwidth: 70dB SNR at 50kHz Input Frequency No Pipeline Delays High Speed Parallel Interface - Word/Byte Modes Full Shutdown Mode: A max 32-Pin LFCSP Package

The AD7938/AD7939 are & 10-bit, high speed, low power, successive approximation (SAR) ADCs. The parts operate from a single 5.25 V power supply and feature throughput rates to 1.5 MSPS. The parts contain a low noise, wide bandwidth, differential track/hold amplifier that can handle input frequencies to 20MHz. The AD7938/AD7939 feature 8 analog input channels with a channel sequencer to allow a pre-programmed selection of channels to be converted sequentially. These parts can operate with either Single-ended, Fully Differential or Pseudo Differential analog inputs. The analog input configuration is chosen by setting the relevant bits in the on-chip Control Register. The conversion process and data acquisition are controlled using standard control inputs allowing easy interfacing to Microprocessors and Dsps. The input signal is sampled on the falling edge of CONVST and the conversion is also initiated at this point. The AD7938/AD7939 has an accurate on-chip 2.5 V reference that can be used as the reference source for the analog to digital conversion. Alternatively, this pin can be overdriven to provide an external reference in the range 3.5 V.

These parts use advanced design techniques to achieve very low power dissipation at high throughput rates. They also feature flexible power management options. An on-chip Control register allows the user to set up different operating conditions including analog input range and configuration, output coding, power management and channel sequencing.

1. High Throughput with Low Power Consumption The AD7938/AD7939 offer 1.5 MSPS throughput with 8mW power consumption at VDD 3V. 2. Eight Analog Inputs with a Channel Sequencer. A sequence of input channels can be selected, through which the AD7938/AD7939 will continuously cycle and convert on. 3. Accurate on-chip 2.5 V reference. 4. Software Configurable Analog Inputs Single-Ended, Pseudo Differential or Fully Differential analog inputs that are software selectable. 5. Single-supply Operation with VDRIVE Function. The AD7938/AD7939 operates from a single 5.25 V supply. The VDRIVE function allows the parallel interface to connect directly to either 5 V proces sor systems independent of VDD. 6. No Pipeline Delay The parts feature a standard successive-approximation ADC with accurate control of the sampling instant via a CONVST input and once off conversion control.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106,U.S.A. Tel: 781/329-4700 World Wide Web Site: Fax: 781/326-8703 Analog Devices, Inc., 2003

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Parameter DYNAMIC PERFORMANCE Signal to Noise + Distortion 2 (SINAD) Signal to Noise Ratio (SNR)2 Total Harmonic Distortion (THD) 2 Peak Harmonic or Spurious Noise (SFDR) 2 Intermodulation Distortion (IMD) 2 Second Order Terms Third Order Terms Aperture Delay Aperture Jitter Channel-to-Channel Isolation 2 Full Power Bandwidth DC ACCURACY Resolution Integral Nonlinearity 2 Differential Nonlinearity 2 Total Unadjusted Error 0V to VREF IN Input Range3 Offset Error Offset Error Match Gain Error Gain Error Match 2 x VREF IN Input Range4 Positive Gain Error Positive Gain Error Match Zero Code Error Zero Code Error Match Negative Gain Error Negative Gain Error Match ANALOG INPUT Input Voltage Ranges

( VDD to 5.25V, VREFIN/VREFOUT = 2.5V unless otherwise noted, FCLKIN = 20MHz, FSAMPLE = 1.5 MSPS; TA = TMIN to TMAX, unless otherwise noted.)

Guaranteed No Missed Codes to 12 Bits. Straight Binary Output Coding

-VREF IN to +VREF IN Biased about VREF with Twos Complement Output Coding to VREF 1 10 LSB V A max pF typ V A max Vmin/max ppm/C typ V min V max A max pF max 1% Specified Performance max RANGE bit in the Control register set to 1. RANGE bit in the Control register set to 0. VDD/VDRIVE 5.25 V for 0-2VREF range

DC Leakage Current Input Capacitance REFERENCE INPUT/OUTPUT V REFIN Input Voltage DC Leakage Current VREFOUT Output Voltage V REFOUT Tempco V REF Output Impedance LOGIC INPUTS Input High Voltage, VINH Input Low Voltage, VINL Input Current, IIN Input Capacitance, CIN6 LOGIC OUTPUTS Output High Voltage, VOH Output Low Voltage, VOL Floating-State Leakage Current Floating-State Output Capacitance 6 Output Coding

ISOURCE = 200 A; VDD V I SINK =200A CODING bit in the control register set to 1. CODING bit in the control register set to 0. REV. PrD

Parameter CONVERSION RATE Conversion Time Track/Hold Acquisition Time Throughput Rate POWER REQUIREMENTS DD V DRIVE I DD Normal Mode(Static) Normal Mode (Operational) Auto StandBy Mode Auto Shutdown Mode Full Shut-Down Mode Power Dissipation Normal Mode (Operational) Auto Standby-Mode (Static) Auto Shutdown-Mode (Static) Full Shutdown-Mode 12

B Version1 Units CLKIN cycles (max) ns max ns max MSPS max V min/max V min/max mA typ mA max mA max mA typ A max mA typ A max A max mW max mW max W max W max W max W max W max W max Digital VDD = VDD = VDD = I/Ps 0V or VDRIVE. to 3.6V. Test Conditions/Comments

Sine Wave Input Full-Scale Step Input Conversion Time + Acquisition Time

NOTES 1 Temperature ranges as follows: B Versions: +85C. 2 See Terminology Section. 3 Bit 9 in the Control register set 1 4 Bit 9 in the Control register set 0 5 This device is operational with an external reference in the range V. 6 Sample tested +25C to ensure compliance. Specifications subject to change without notice.


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