AD589UH AD [Analog Devices], AD589UH Datasheet

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AD589UH

Manufacturer Part Number
AD589UH
Description
LC2MOS 5 us 8-Bit ADC with Track/Hold
Manufacturer
AD [Analog Devices]
Datasheet

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a
GENERAL DESCRIPTION
The AD7575 is a high speed 8-bit ADC with a built-in track/
hold function. The successive approximation conversion tech-
nique is used to achieve a fast conversion time of 5 s, while the
built-in track/hold allows full-scale signals up to 50 kHz (386 mV/ s
slew rate) to be digitized. The AD7575 requires only a single +5 V
supply and a low cost, 1.23 V bandgap reference in order to convert
an input signal range of 0 to 2 V
The AD7575 is designed for easy interfacing to all popular 8-bit
microprocessors using standard microprocessor control signals
(CS and RD) to control starting of the conversion and reading of
the data. The interface logic allows the AD7575 to be easily
configured as a memory mapped device, and the part can be
interfaced as SLOW-MEMORY or ROM. All data outputs of
the AD7575 are latched and three-state buffered to allow direct
connection to a microprocessor data bus or I/O port.
The AD7575 is fabricated in an advanced, all ion-implanted high
speed Linear Compatible CMOS (LC
available in a small, 0.3" wide, 18-lead DIP, 18-lead SOIC or in
other 20-terminal surface mount packages.
REV. B
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.
FEATURES
Fast Conversion Time: 5 s
On-Chip Track/Hold
Low Total Unadjusted Error: 1 LSB
Full Power Signal Bandwidth: 50 kHz
Single +5 V Supply
100 ns Data Access Time
Low Power (15 mW typ)
Low Cost
Standard 18-Lead DlPs or 20-Terminal
Surface Mount Packages
REF
.
2
MOS) process and is
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
PRODUCT HIGHLIGHTS
1. Fast Conversion Time/Low Power
2. On-Chip Track/Hold
3. Low Total Unadjusted Error
4. Single Supply Operation
5. Fast Digital Interface
5 s 8-Bit ADC with Track/Hold
AGND
The fast, 5 s, conversion time of the AD7575 makes it
suitable for digitizing wideband signals at audio and ultra-
sonic frequencies while retaining the advantage of low
CMOS power consumption.
The on-chip track/hold function is completely self-contained
and requires no external hold capacitor. Signals with slew
rates up to 386 mV/ s (e.g., 2.46 V peak-to-peak 50 kHz sine
waves) can be digitized with full accuracy.
The zero, full-scale and linearity errors of the AD7575 are so
low that the total unadjusted error at any point on the trans-
fer function is less than 1 LSB, and offset and gain adjust-
ments are not required.
Operation from a single +5 V supply with a low cost +1.23 V
bandgap reference allows the AD7575 to be used in 5 V
microprocessor systems without any additional power
supplies.
Fast interface timing allows the AD7575 to interface easily to
the fast versions of most popular microprocessors such as the
Z80H, 8085A-2, 6502B, 68B09 and the DSP processor, the
TMS32010.
V
CLK
AIN
REF
RD
CS
TP
OSCILLATOR
FUNCTIONAL BLOCK DIAGRAM
CLOCK
BUSY
CONTROL
LOGIC
World Wide Web Site: http://www.analog.com
TRACK
HOLD
AND
DAC
SAR
COMP
OUTPUT DRIVERS
© Analog Devices, Inc., 1998
THREE STATE
LATCH AND
V
DD
AD7575
AD7575
DGND
LC
2
DB0
MOS
DB7

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AD589UH Summary of contents

Page 1

FEATURES Fast Conversion Time On-Chip Track/Hold Low Total Unadjusted Error: 1 LSB Full Power Signal Bandwidth: 50 kHz Single +5 V Supply 100 ns Data Access Time Low Power (15 mW typ) Low Cost Standard 18-Lead DlPs ...

Page 2

AD7575–SPECIFICATIONS Parameter J, A Versions ACCURACY Resolution 8 Total Unadjusted Error 2 Relative Accuracy 1 Minimum Resolution for Which No Missing Codes Is Guaranteed 8 Full-Scale Error + MIN MAX 2 Offset Error +25 ...

Page 3

TIMING SPECIFICATIONS Limit at +25 C Limit at T Parameter (All Versions) ( Versions 100 100 100 100 3 t 100 100 ...

Page 4

AD7575 DIP/SOIC REF TP AIN 3 16 BUSY AGND 4 15 AD7575 CLK 5 14 DB0 (LSB) TOP VIEW (Not to Scale) DB7 (MSB DB1 DB6 7 12 DB2 ...

Page 5

CS RD BUSY HIGH IMPEDANCE DATA BUS Figure 3. Slow Memory Interface Timing Diagram TIMING AND CONTROL OF THE AD7575 The two logic inputs on the AD7575, CS and RD, control both the starting of conversion and the reading of ...

Page 6

AD7575 BUSY t 3 HIGH DATA IMPEDANCE BUS Figures 6 and 7 show connection diagrams for interfacing the AD7575 in the ROM Interface mode. Figure 6 shows the AD7575 interface to the 6502/6809 microprocessors while the ...

Page 7

A SAMPLED-DATA INPUT The AD7575 makes use of a sampled-data comparator. The equivalent input circuit is shown in Figure 9. When a conversion starts, switch S1 is closed, and the equivalent input capacitance is charged With a ...

Page 8

AD7575 INTERNAL/EXTERNAL CLOCK The AD7575 can be used with its own internal clock or with an externally applied clock. In either case, the clock signal appear- ing at the CLK pin is divided internally by two to provide an internal ...

Page 9

UNIPOLAR OPERATION The basic operation for the AD7575 is in the unipolar single supply mode. Figure 15 shows the circuit connections to achieve this, while the nominal transfer characteristic for unipolar opera- tion is given in Figure 16. Since the ...

Page 10

AD7575 APPLICATION HINTS 1. NOISE: Both the input signal lead to AIN and the signal return lead from AGND should be kept as short as possible to minimize input-noise coupling. In applications where this is not possible, either a shielded ...

Page 11

... C to +70 C AD589MH +70 C AD589SH – +125 C AD589TH – +125 C AD589UH – +125 C *Excluding resistor and offset drift. REV. B Taking the 25 C measurement as the starting point, the full-scale error introduced is always in the negative direction whether the temperature goes to T seen from the AD589 temperature characteristic shown in Fig- ure 20 ...

Page 12

AD7575 18-Lead Plastic DIP (N-18) 0.91 (23.12) 0.89 (22.61 0.26 (6.61) 0.24 (6.10 PIN 1 0.175 (4.45) 0.18 (4.58) 0.12 (3.05) MAX 0.02 (0.508) 0.105 (2.67) 0.065 (1.66) 0.015 (0.381) 0.095 (2.42) 0.045 (1.15) SEATING PLANE ...

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