AD7828BRS Analog Devices, AD7828BRS Datasheet

AD7828BRS

Manufacturer Part Number

AD7828BRS

Description

0-7V; 450mW; LC2MOS high speed, uP-compatible 8-bit ADC

Manufacturer

Analog Devices

Datasheet

1.AD7828BRS.pdf (12 pages)

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GENERAL DESCRIPTION

The AD7824 and AD7828 are high-speed, multichannel, 8-bit

ADCs with a choice of 4 (AD7824) or 8 (AD7828) multiplexed

analog inputs. A half-flash conversion technique gives a fast

conversion rate of 2.5 µs per channel and the parts have a built-

in track/hold function capable of digitizing full-scale signals of

10 kHz (157 mV/µs slew rate) on all channels. The AD7824 and

AD7828 operate from a single 5 V supply and have an analog

input range of 0 V to 5 V, using an external 5 V reference.

Microprocessor interfacing of the parts is simple, using standard

Chip Select (CS) and Read (RD) signals to initiate the conver-

sion and read the data from the three-state data outputs. The

half-flash conversion technique means that there is no need to

generate a clock signal for the ADC. The AD7824 and AD7828

can be interfaced easily to most popular microprocessors.

The AD7824 and AD7828 are fabricated in an advanced, all

ion-implanted, linear-compatible CMOS process (LC

and have low power dissipation of 40 mW (typ). The AD7824

is available in a 0.3" wide, 24-lead “skinny” DIP, while the

AD7828 is available in a 0.6" wide, 28-lead DIP and in 28-

terminal surface mount packages.

MOS)

PRODUCT HIGHLIGHTS

1. 4- or 8-channel input multiplexer gives cost-effective space-

2. Fast conversion rate of 2.5 µs/channel features a per channel

3. Built-in track-hold function allows handling of 4- or 8-

4. Tight total unadjusted error spec and channel-to-channel

5. Single 5 V supply simplifies system power requirements.

6. Fast, easy-to-use digital interface allows connection to most

REF

saving multichannel ADC system.

sampling frequency of 100 kHz for the AD7824 or 50 kHz

for the AD7828.

channels up to 10 kHz bandwidth (157 mV/µs slew rate).

matching eliminate the need for user trims.

popular microprocessors with minimal external components.

No clock signal is required for the ADC.

AIN 4

AIN 8

AIN 1

(+)

(–)

ADDRESS

A0 A1 A2

DECODE

LATCH

MUX

AD7824 – 4-CHANNEL MUX

AD7828 – 8-CHANNEL MUX

A2 – AD7828 ONLY

4- & 8-Channel 8-Bit ADCs

FUNCTIONAL BLOCK DIAGRAM

AD7824/AD7828

REF

(+)

MOS High Speed

FLASH

(4MSB)

FLASH

(4LSB)

4-BIT

ADC

DAC

ADC

RDY

TIMING AND CONTROL

CIRCUITRY

DRIVERS

THREE

STATE

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

INT

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AD7828BRS Summary of contents

Page 1

GENERAL DESCRIPTION The AD7824 and AD7828 are high-speed, multichannel, 8-bit ADCs with a choice of 4 (AD7824 (AD7828) multiplexed analog inputs. A half-flash conversion technique gives a fast conversion rate of 2.5 µs per channel and the ...

Page 2

AD7824/AD7828–SPECIFICATIONS noted. All specifications unless otherwise noted. Specifications apply for Mode 0.) MIN MAX Parameter K Version ACCURACY Resolution 8 ± Total Unadjusted Error Minimum Resolution for which No Missing Codes Are Guaranteed 8 ± ...

Page 3

TIMING CHARACTERISTICS Limit at Limit MIN Parameter (All Grades) ( Grades CSS CSH RDY t ...

Page 4

... AD7824CQ AD7824TQ AD7824UQ AD7828KN AD7828LN AD7828KP AD7828LP AD7828BQ AD7828CQ AD7828BR AD7828BRS AD7828TQ AD7828UQ AD7828TE AD7828UE Available to /883B processing only. Contact our local sales office for military data sheet. For U.S. Standard Military Drawing (SMD) see DESC Drawing #5692-88764. WARNING! ESD SENSITIVE DEVICE ...

Page 5

Typical Performance Characteristics–AD7824/AD7828 ...

Page 6

AD7824/AD7828 OPERATIONAL DIAGRAM The AD7824 is a 4-channel 8-bit A/D converter and the AD7828 is an 8-channel 8-bit A/D converter. Operational dia- grams for both of these devices are shown in Figures 3 and 4. The addition of just a ...

Page 7

INPUT CURRENT Due to the novel conversion techniques employed by the AD7824/ AD7828, the analog input behaves somewhat differently than in conventional devices. The ADC’s sampled-data comparators take varying amounts of input current depending on which cycle the conversion is ...

Page 8

AD7824/AD7828 UNIPOLAR OPERATION The analog input range for any channel of the AD7824/ AD7828 shown in the unipolar operational diagram of Fig- ure 10. Figure 11 shows the designed code transitions which occur ...

Page 9

MODE 0 Figure 14 shows the timing diagram for Mode 0 operation. This mode can only be used for microprocessors which have a WAIT state facility, whereby a READ instruction cycle can be extended to accommodate slow memory devices. A ...

Page 10

AD7824/AD7828 MICROPROCESSOR INTERFACING The AD7824/AD7828 is designed to interface to microproces- sors as Read Only Memory (ROM). Analog channel selection, conversion start and data read operations are controlled by CS, RD and the channel address inputs. These signals are common ...

Page 11

... TYP TYP LEAD NO. 1 IDENTIFIED BY DOT OR NOTCH CERDIP LEADS WILL BE EITHER TIN/LEAD PLATED OR SOLDER DIPPED IN ACCORDANCE WITH MIL-M-38510 REQUIREMENTS NOTE 1 Analog Devices reserves the right to ship either cerdip (Q-24, Q-28) or ceramic (D-24A, D-28) hermetic packages. +5V V AIN AIN 2 ...

Page 12

... SEATING 0.0118 (0.30) 0.0125 (0.32) (1.27) PLANE 0.0138 (0.35) 0.0040 (0.10) 0.0091 (0.23) BSC 5 11 NOTE 1 Analog Devices reserves the right to ship either cerdip (Q-24, Q-28) or ceramic ( D-24A, D-28) hermetic packages. OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 1 28-Lead Shrink Small Outline Package (RS-28) 28 0.62 (15.74) 0.59 (14.93) 0.18 (4.57) MAX 1 15° 0.012 (0.305) 0° ...

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