CONVERTER IC

AD7828KPZ-REEL

Manufacturer Part NumberAD7828KPZ-REEL
DescriptionCONVERTER IC
ManufacturerAnalog Devices Inc
AD7828KPZ-REEL datasheet
 


Specifications of AD7828KPZ-REEL

Number Of Bits8Sampling Rate (per Second)50k
Data InterfaceParallelNumber Of Converters3
Power Dissipation (max)100mWVoltage Supply SourceSingle Supply
Operating Temperature0°C ~ 70°CMounting TypeSurface Mount
Package / Case28-LCC (J-Lead)Lead Free Status / RoHS StatusLead free / RoHS Compliant
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FEATURES
4 or 8 Analog Input Channels
Built-In Track-and-Hold Function
10 kHz Signal Handling on Each Channel
Fast Microprocessor Interface
Single 5 V Supply
Low Power: 50 mW
Fast Conversion Rate: 2.5 s/Channel
Tight Error Specification: 1/2 LSB
GENERAL DESCRIPTION
The AD7824 and AD7828 are high speed, multichannel, 8-bit
ADCs with a choice of four (AD7824) or eight (AD7828) multi-
plexed 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-and-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 conversion
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
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.
REV. F
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
4- and 8-Channel 8-Bit ADCs
FUNCTIONAL BLOCK DIAGRAM
V
(+)
REF
V
(–)
REF
AIN1
AIN4
MUX*
AIN8
ADDRESS
LATCH
DECODE
A0 A1 A2**
*AD7824 – 4-CHANNEL MUX
**AD7828 – 8-CHANNEL MUX
A2 – AD7828 ONLY
PRODUCT HIGHLIGHTS
1. 4- or 8-channel input multiplexer gives cost effective,
space-saving multichannel ADC system.
2. Fast conversion rate of 2.5 µs/channel features a per-channel
sampling frequency of 100 kHz for the AD7824 or 50 kHz
for the AD7828.
3. Built-in track-and-hold function allows handling of four or
eight channels up to 10 kHz bandwidth (157 mV/µs slew rate).
4. Tight total unadjusted error spec and channel-to-channel
matching eliminate the need for user trims.
5. Single 5 V supply simplifies system power requirements.
6. Fast, easy-to-use digital interface allows connection to most
popular microprocessors with minimal external components.
No clock signal is required for the ADC.
2
MOS) and
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
© 2003 Analog Devices, Inc. All rights reserved.
2
LC
MOS High Speed
AD7824/AD7828
DB7
4-BIT
FLASH
DB6
ADC
DB5
(4MSB)
DB4
THREE-
4-BIT
STATE
DAC
DRIVERS
V
(+)
REF
DB3
4-BIT
16
FLASH
DB2
ADC
DB1
(4LSB)
DB0
TIMING AND CONTROL
INT
CIRCUITRY
CS
RD
RDY
www.analog.com

AD7828KPZ-REEL Summary of contents

  • Page 1

    FEATURES Analog Input Channels Built-In Track-and-Hold Function 10 kHz Signal Handling on Each Channel Fast Microprocessor Interface Single 5 V Supply Low Power Fast Conversion Rate: 2.5 s/Channel Tight Error Specification: 1/2 LSB GENERAL ...

  • Page 2

    AD7824/AD7828–SPECIFICATIONS noted. All specifications unless otherwise noted. Specifications apply to 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 Limit at T Parameter (All Grades) ( Grades CSS CSH RDY t 2.0 ...

  • Page 4

    AD7824/AD7828 ABSOLUTE MAXIMUM RATINGS 25°C, unless otherwise noted ...

  • Page 5

    T – AMBIENT TEMPERATURE – TPC 1. Conversion Time vs. Temperature 2.0 1.5 1.0 0 – REF REF *1LSB = 256 TPC 2. ...

  • Page 6

    AD7824/AD7828 OPERATIONAL DIAGRAM The AD7824 is a 4-channel 8-bit ADC and the AD7828 is an 8-channel 8-bit ADC. Operational diagrams for both of these devices are shown in Figures 3 and 4. The addition of just reference ...

  • 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 Figure 10. Figure 11 shows the designed code transitions that occur midway between ...

  • Page 9

    MODE 0 Figure 14 shows the timing diagram for Mode 0 operation. This mode can only be used for microprocessors that 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 microprocessors as Read Only Memory (ROM). Analog channel selection, con- version start, and data read operations are controlled by CS, RD, and the channel address inputs. These signals are common ...

  • Page 11

    BAND-PASS FILTER 1 BAND-PASS FILTER 2 SPEECH AMP INPUT BAND-PASS FILTER 7 BAND-PASS FILTER 8 5V Figure 19. Speech Analysis Using Real-Time Filtering 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 0.250 (6.35) MAX 0.200 (5.05) 0.115 (2.93) REV ...

  • Page 12

    AD7824/AD7828 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 OUTLINE DIMENSIONS 24-Lead Standard Small Outline Package [SOIC] Wide Body (R-24) Dimensions shown in millimeters and (inches) 15.60 (0.6142) 15.20 (0.5984 7.60 (0.2992) 7.40 (0.2913) ...

  • Page 13

    Ceramic DIP - Glass Hermetic Seal [CERDIP] 0.005 (0.13) MIN PIN 1 0.200 (5.08) MAX 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY ...

  • Page 14

    AD7824/AD7828 2.00 MAX 0.05 MIN 0.048 (1.22) 0.042 (1.07) 4 0.048 (1.22) 5 0.042 (1.07) TOP VIEW (PINS DOWN 0.456 (11.582) 0.450 (11.430) 0.495 (12.57) 0.485 (12.32) OUTLINE DIMENSIONS 28-Lead Shrink Small Outline Package [SSOP] (RS-28) Dimensions shown ...

  • Page 15

    Revision History Location 1/03—Data Sheet changed from REV REV. F. Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . ...

  • Page 16

    –16– ...