AD7492ARZ Analog Devices Inc, AD7492ARZ Datasheet

AD7492ARZ

Manufacturer Part Number

AD7492ARZ

Description

IC ADC 12BIT W/REF W/CLK 24-SOIC

Manufacturer

Analog Devices Inc

Datasheet

1.AD7492ARZ.pdf (16 pages)

Specifications of AD7492ARZ

Data Interface

Parallel

Number Of Bits

Sampling Rate (per Second)

1.25M

Number Of Converters

Power Dissipation (max)

16.5mW

Voltage Supply Source

Analog and Digital

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

24-SOIC (0.300", 7.50mm Width)

Resolution (bits)

12bit

Input Channel Type

Single Ended

Supply Voltage Range - Analogue

2.7V To 5.25V

Supply Voltage Range - Digital

2.7V To 5.25V

Supply Current

3mA

Sampling Rate

1MSPS

Rohs Compliant

Yes

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

For Use With

EVAL-AD7492CBZ - BOARD EVALUATION FOR AD7492

Lead Free Status / RoHS Status

Lead free / RoHS Compliant, Lead free / RoHS Compliant

Available stocks

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Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AD7492ARZ

Manufacturer:

Analog Devices Inc

Quantity:

135

Company:

Meier Automation Equipment Co., Limited

Part Number:

AD7492ARZ

Manufacturer:

ADI/亚德诺

Quantity:

20 000

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GENERAL DESCRIPTION

The AD7492 and AD7492-5 are 12-bit high-speed, low power,

successive-approximation ADCs. The parts operate from a

single 2.7 V to 5.25 V power supply and feature throughput rates

up to 1.25 MSPS. They contain a low-noise, wide bandwidth

track/hold amplifier that can handle bandwidths up to 10 MHz.

The conversion process and data acquisition are controlled using

standard control inputs allowing easy interface to microproces-

sors or DSPs. The input signal is sampled on the falling edge of

CONVST and conversion is also initiated at this point. The

BUSY goes high at the start of conversion and goes low 880 ns

(AD7492) or 680 ns (AD7492-5) later to indicate that the con-

version is complete. There are no pipeline delays associated with

the part. The conversion result is accessed via standard CS and

RD signals over a high-speed parallel interface.

The AD7492 uses advanced design techniques to achieve very

low power dissipation at high throughput rates. With 5 V

supplies and 1.25 MSPS, the average current consumption

AD7492-5 is typically 2.75 mA. The part also offers flexible

power/throughput rate management.

It is also possible to operate the part in a full sleep mode and a

partial sleep mode, where the part wakes up to do a conversion

and automatically enters a sleep mode at the end of conversion.

The type of sleep mode is hardware selected by the PS/FS pin.

Using these sleep modes allows very low power dissipation num-

bers at lower throughput rates.

The analog input range for the part is 0 to REF IN. The 2.5 V

reference is supplied internally and is available for external refer-

encing. The conversion rate is determined by the internal clock.

1.25 MSPS, 16 mW Internal REF and CLK,

PRODUCT HIGHLIGHTS

1. High Throughput with Low Power Consumption

2. Flexible Power/Throughput Rate Management

3. No Pipeline Delay

4. Flexible Digital Interface

5. Fewer Peripheral Components

CONVST

The AD7492-5 offers 1.25 MSPS throughput with 16 mW

power consumption.

The conversion time is determined by an internal clock. The

part also features two sleep modes, partial and full, to maxi-

mize power efficiency at lower throughput rates.

The part features a standard successive-approximation ADC

with accurate control of the sampling instant via a CONVST

input and once-off conversion control.

The V

digital pins.

The AD7492 optimizes PCB space by using an internal

Reference and internal CLK.

VIN

DRIVE

2.5V

REF

FUNCTIONAL BLOCK DIAGRAM

AD7492

AVDD

feature controls the voltage levels on the I/O

T/H

DVDD

BUF

12-Bit Parallel ADC

AGND

12-BIT SAR

CONTROL

REF OUT

LOGIC

ADC

OSCILLATOR

CLOCK

DGND

DRIVERS

OUTPUT

VDRIVE

AD7492

DB11

DB0

PS/FS

BUSY

Related parts for AD7492ARZ

AD7492ARZ Summary of contents

Page 1

GENERAL DESCRIPTION The AD7492 and AD7492-5 are 12-bit high-speed, low power, successive-approximation ADCs. The parts operate from a single 2 5.25 V power supply and feature throughput rates up to 1.25 MSPS. They contain a low-noise, wide ...

Page 2

AD7492 AD7492-5–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal to Noise + Distortion (SINAD) Signal-to-Noise Ratio (SNR) Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion (IMD) Second Order Terms Third Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth ...

Page 3

AD7492–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal to Noise + Distortion (SINAD) Signal-to-Noise Ratio (SNR) Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion (IMD) Second Order Terms Third Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth DC ...

Page 4

AD7492 1 TIMING SPECIFICATIONS Limit at T MIN Parameter AD7492 t 880 CONVERT WAKEUP 500 ...

Page 5

ABSOLUTE MAXIMUM RATINGS (T = 25°C unless otherwise noted AGND/DGND . . . . . . . . . . . . . . . . . –0 AGND/DGND ...

Page 6

AD7492 Pin Mnemonic Function 1–3, DB9–DB11, Data Bit 0 to DB11. Parallel digital outputs that provide the conversion result for the part. These are three-state outputs that are controlled by CS and RD. The output high voltage level for these ...

Page 7

TERMINOLOGY Integral Nonlinearity This is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. The end- points of the transfer function are zero scale, a point 1/2 LSB below the first code transition, ...

Page 8

AD7492 –Typical Performance Characteristics 500 1000 1500 INPUT FREQUENCY – kHz 100 200 350 500 ...

Page 9

CODE 1 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1 1023 1534 2045 2556 0 512 CODE CIRCUIT DESCRIPTION CONVERTER OPERATION ...

Page 10

AD7492 + DRIVE DV DD 1nF AD7492 C/ P REF OUT 2.5V 100nF PARALLELED DB0– INTERFACE DB9 (DB11) CS PS/FS CONVST RD BUSY ADC TRANSFER FUNCTION The output coding of the AD7492 is straight binary. ...

Page 11

CONVST BUSY CS RD DBx CONVST BUSY DBx this mode a new conversion should not be initiated until 140 ns after BUSY goes low. This acquisition time allows the track/hold circuit to accurately acquire the input signal. As mentioned earlier, ...

Page 12

AD7492 V DRIVE The V pin is used as the voltage supply to the digital output DRIVE drivers and the digital input circuitry separate supply from AV and DV . The purpose of using a separate supply ...

Page 13

Figure 15 to Figure 17 show a typical graphical representation of Power versus Throughput for the AD7492 when in (a) Mode and 3 V, (b) Mode 2 in full sleep mode @ 5 V and 3 ...

Page 14

AD7492 POWER SUPPLIES Separate power supplies for AV and necessary, DV may share its power connection The digital supply (DV ) must not exceed the analog supply DD ( more than 0.3 ...

Page 15

AD7492 to 80C186 Interface Figure 23 shows the AD7492 interfaced to the 80C186 micropro- cessor. The 80C186 DMA controller provides two independent high-speed DMA channels where data transfer can occur between memory and I/O spaces. (The AD7492 occupies one of ...

Page 16

AD7492 PIN 1 0.0118 (0.30) 0.0040 (0.10) PIN 1 0.006 (0.15) 0.002 (0.05) SEATING PLANE OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Lead SOIC (R-24) 0.6141 (15.60) 0.5985 (15.20 0.2992 (7.60) 0.2914 (7.40) 0.4193 (10.65 ...

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