AD1671KP Analog Devices Inc, AD1671KP Datasheet

IC ADC SNGL 12BIT 28PLCC

AD1671KP

Manufacturer Part Number
AD1671KP
Description
IC ADC SNGL 12BIT 28PLCC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD1671KP

Rohs Status
RoHS non-compliant
Number Of Bits
12
Sampling Rate (per Second)
1.25M
Data Interface
Parallel
Number Of Converters
2
Power Dissipation (max)
750mW
Voltage Supply Source
Analog and Digital, Dual ±
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
28-LCC (J-Lead)

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD1671KP
Manufacturer:
Analog Devices Inc
Quantity:
10 000
Part Number:
AD1671KP
Manufacturer:
ADI
Quantity:
1 364
Part Number:
AD1671KPZ
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ADI
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1 364
Part Number:
AD1671KPZ
Manufacturer:
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Quantity:
20 000
a
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
Conversion Time: 800 ns
1.25 MHz Throughput Rate
Complete: On-Chip Sample-and-Hold Amplifier and
Low Power Dissipation: 570 mW
No Missing Codes Guaranteed
Signal-to-Noise Plus Distortion Ratio
Pin Configurable Input Voltage Ranges
Twos Complement or Offset Binary Output Data
28-Pin DIP and 28-Pin Surface Mount Package
Out of Range Indicator
PRODUCT DESCRIPTION
The AD1671 is a monolithic 12-bit, 1.25 MSPS analog-to-
digital converter with an on-board, high performance sample-
and-hold amplifier (SHA) and voltage reference. The AD1671
guarantees no missing codes over the full operating tempera-
ture range. The combination of a merged high speed bipolar/
CMOS process and a novel architecture results in a combi-
nation of speed and power consumption far superior to pre-
viously available hybrid implementations. Additionally, the
greater reliability of monolithic construction offers improved
system reliability and lower costs than hybrid designs.
The fast settling input SHA is equally suited for both multi-
plexed systems that switch negative to positive full-scale
voltage levels in successive channels and sampling inputs at
frequencies up to and beyond the Nyquist rate. The AD1671
provides both reference output and reference input pins, al-
lowing the on-board reference to serve as a system reference.
An external reference can also be chosen to suit the dc accu-
racy and temperature drift requirements of the application.
The AD1671 uses a subranging flash conversion technique,
with digital error correction for possible errors introduced in
the first part of the conversion cycle. An on-chip timing gen-
erator provides strobe pulses for each of the four internal
flash cycles. A single ENCODE pulse is used to control the
converter. The digital output data is presented in twos
complement or offset binary output format. An out-of-range
signal indicates an overflow condition. It can be used with
the most significant bit to determine low or high overflow.
Voltage Reference
f
IN
= 100 kHz: 70 dB
PRODUCT HIGHLIGHTS
The AD1671 offers a complete single chip sampling 12-bit,
1.25 MSPS analog-to-digital conversion function in a 28-pin
package.
The AD1671 at 570 mW consumes a fraction of the power of
currently available hybrids.
An OUT OF RANGE output bit indicates when the input sig-
nal is beyond the AD1671’s input range.
Input signal ranges are 0 V to +5 V unipolar or 5 V bipolar,
selected by pin strapping, with an input resistance of 10 k .
The input signal range can also be pin strapped for 0 V to +2.5 V
unipolar or 2.5 V bipolar with an input resistance of 10 M .
Output data is available in unipolar, bipolar offset or bipolar
twos complement binary format.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
The performance of the AD1671 is made possible by using high
speed, low noise bipolar circuitry in the linear sections and low
power CMOS for the logic sections. Analog Devices’ ABCMOS-1
process provides both high speed bipolar and 2-micron CMOS
devices on a single chip. Laser trimmed thin-film resistors are
used to provide accuracy and temperature stability.
The AD1671 is available in two performance grades and three
temperature ranges. The AD1671J and K grades are available
over the 0 C to +70 C temperature range. The AD1671A grade
is available over the –40 C to +85 C temperature range. The
AD1671S grade is available over the –55 C to +125 C tempera-
ture range.
REF OUT
REF IN
AIN2
AIN1
Complete 12-Bit 1.25 MSPS
5k
5k
REF COM
FLASH
2.5V
REF
3-BIT
FUNCTIONAL BLOCK DIAGRAM
Monolithic A/D Converter
S/H
SHA
OUT
3
AD1671
SELECT
RANGE
DAC
UPO/BPO
CORRECTION LOGIC
FLASH
ENCODE
3-BIT
3
OTR
V
CC
DAC
MSB
ACOM
AD1671
8
LATCHES
COARSE
FLASH
4-BIT
V
X4
BIT 1 –12
EE
Fax: 617/326-8703
4
V
LOGIC
12
LADDER
MATRIX
FLASH
8-BIT
DCOM
4-BIT
FINE
DAV
4

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AD1671KP Summary of contents

Page 1

FEATURES Conversion Time: 800 ns 1.25 MHz Throughput Rate Complete: On-Chip Sample-and-Hold Amplifier and Voltage Reference Low Power Dissipation: 570 mW No Missing Codes Guaranteed Signal-to-Noise Plus Distortion Ratio f = 100 kHz Pin Configurable Input ...

Page 2

AD1671–SPECIFICATIONS DC SPECIFICATIONS ( MIN Parameter RESOLUTION CONVERSION TIME ACCURACY Integral Nonlinearity (INL) (S Grade) Differential Nonlinearity (DNL) No Missing Codes 1 Unipolar Offsets (+ Bipolar Zero (+ Gain Error (+ ...

Page 3

T MIN AC SPECIFICATIONS f = 1OO kHz, unless otherwise noted) lNPUT Parameter SIGNAL-TO-NOISE PLUS DISTORTION RATIO (S –0.5 dB Input –20 dB Input EFFECTIVE NUMBER OF BITS (ENOB) TOTAL HARMONIC DISTORTION (THD) PEAK SPURIOUS OR ...

Page 4

AD1671 Symbol Pin No. Type Name and Function ACOM 27 P Analog Ground. AIN 22 Analog Inputs, AIN1 and AIN2. The AD1671 can be pin strapped for four input ranges: Range 0 to +2 ...

Page 5

... Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. REV. B Max Units 1 Model +6.5 Volts +0.5 Volts AD1671JQ +6.5 Volts AD1671KQ +1.0 Volts AD1671JP +6.5 Volts AD1671KP V + 0.5 Volts AD1671AQ LOGIC V + 0.5 Volts AD1671AP CC +11.0 Volts AD1671SQ V + 0.5 Volts CC NOTES +150 C ...

Page 6

AD1671 DEFINITIONS OF SPECIFICATIONS INTEGRAL NONLINEARITY (INL) Integral nonlinearity refers to the deviation of each individual code from a line drawn from “zero” through “full scale.” The point used as “zero” occurs 1/2 LSB (1.22 mV for ...

Page 7

THEORY OF OPERATION The AD1671 uses a successive subranging architecture. The analog-to-digital conversion takes place in four independent steps or flashes. The sampled analog input signal is subranged to an intermediate residue voltage for the final 12-bit result by utilizing ...

Page 8

AD1671 Figure 4 plots both S/(N+D) and Effective Number of Bits (ENOB) for a 100 kHz input signal sampled from 666 kHz to 1.25 MHz. 72.5 72 71.5 71 70.5 70 69.5 69 68.5 68 666 714 769 833 909 ...

Page 9

Table list of grounding and decoupling rules that should be reviewed before laying out a printed circuit board. Table I. Grounding and Decoupling Guidelines Power Supply Decoupling Comment Capacitor Values 0.1 F (Ceramic) and 1 F (Tantalum) ...

Page 10

AD1671 UNIPOLAR ( +2.5 V) CALIBRATION The connections for the +2.5 V input range calibration is shown in Figure 11. Figure 11 shows an example of how the offset error can be trimmed in front ...

Page 11

Input Range +2 –2 +2.5 V Offset Binary – –2 +2.5 V Twos Complement – NOTES 1 Voltages listed ...

Page 12

AD1671 APPLICATIONS AD1671 TO ADSP-2100A Figure 16 demonstrates the AD1671 to ADSP-2100A interface. The 2100A with a clock frequency of 12.5 MHz can execute an instruction in one 80 ns cycle. The AD1671 is configured to perform continuous time sampling. ...

Page 13

Parts List Reference Designator R1, R2 R3, R4 R9, R11 R10 R12 R13 R14 R15–R28 C1, C3, C5 C2, C4, C6, C8, C10 C7, C9, C15, C16 C11, C12, C13, C14, C17 C18 C19–C22 C23 C24 ...

Page 14

AD1671 Figure 18. AD1671/EB PCB Layout—Silkscreen Layer –14– REV. B ...

Page 15

Figure 19. AD1671/EB PCB Layout—Component Side REV. B Figure 20. AD1671/EB PCB Layout—Solder Side –15– AD1671 ...

Page 16

AD1671 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Lead PLCC (P-28A) Package 28-Pin Cerdip (Q-28) Package –16– REV. B ...

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