DataSheet.es    


PDF AD7889 Data sheet ( Hoja de datos )

Número de pieza AD7889
Descripción 12-bit successive approximation analog-to-digital converters
Fabricantes Analog Devices 
Logotipo Analog Devices Logotipo



Hay una vista previa y un enlace de descarga de AD7889 (archivo pdf) en la parte inferior de esta página.


Total 12 Páginas

No Preview Available ! AD7889 Hoja de datos, Descripción, Manual

a
LC2MOS Single Supply,
12-Bit 600 kSPS ADC
Preliminary Technical Information
AD7889
www.datasFhEeAetT4Uu.RcoEmS
Fast 12-Bit ADC with 1.4 µs Conversion Time
Up to 600 kSPS Throughput Rate (Mode A)
Single Supply Operation
On-Chip Track/Hold Amplifier
Selection of Input Ranges:
±10 V or ±5 V for AD7889-1
0 V to +2.5 V or 0V to+5 V for AD7889-2
±2.5 V for AD7889-3
High Speed Serial Interface
Low Power, 60 mW typ
FUNCTIONAL BLOCK DIAGRAM
VREF
VDD
2½K
+2.5V
REFERENCE
AD7889
VIN1 SIGNAL
VIN2 SCALING
TRACK
/HOLD
12-BIT
ADC
RFS
SDATA
SCLK
CONTROL LOGIC
STANDBY
CONVST CONTCLK 16/14B
AGND DGND
GENERAL DESCRIPTION
The AD7889 is a high speed, low power, 12-bit A/D converter
that operates from a single +5 V supply. The part contains a
successive approximation ADC, an on-chip track/hold ampli-
fier, an internal +2.5 V reference and on-chip versatile
interface structures that allows serial communication
to a microprocessor in a variety of operating modes. The part
accepts an analog input range of ±10 V or ±5 V (AD7889-1),
0 V to +2.5 V or 0 V to +5V (AD7889-2) and ±2.5 V
(AD7889-3). Overvoltage protection on the analog inputs for the
AD7889-1 and AD7889-3 allows the input voltage to go to
±17 V or ±7 V respectively without damaging the ports.
The AD7889 offers a choice of serial interface modes which al-
lows direct connection to the serial ports of microcontrollers
and digital signal processors.
In addition to the traditional dc accuracy specifications such as
linearity, full-scale and offset errors, the part is also specified
for dynamic performance parameters including harmonic dis-
tortion and signal-to-noise ratio.
The AD7889 is fabricated in Analog Devices’ Linear Compat-
ible CMOS (LC2MOS) process, a mixed technology process
that combines precision bipolar circuits with low power CMOS
logic. It is available in a 16-pin, SSOP.
PRODUCT HIGHLIGHTS
1. The AD7889 features a conversion time of 1.4µs (Mode A)
and a track/hold acquisition time of 300ns. This allows a
throughput rate for the part up to 600 kSPS. Modes C and
D can be used to allow a throughput rate of 500kSPS.
2. The AD7889 operates from a single +5 V supply and con-
sumes 60 mW typ making it ideal for low power and por-
table applications.
3. The part offers a high speed, serial interface for easy connec-
tion to microprocessors, microcontrollers and digital signal
processors.
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.
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703

1 page




AD7889 pdf
Preliminary Technical Information
AD7889
ORDERING GUIDE
Model
Input
Range
Sample
Rate
Relative
Accuracy
Temperature
Range
Package
Option1
AD7889ARS-1
AD7889BRS-1
www.daAtaDsh7e8e8t49uA.cRomS-2
AD7889ARS-3
EVAL-AD7889-1CB2
EVAL-AD7889-2CB2
EVAL-AD7889-3CB2
EVAL-CONTROL BOARD3
±5 V or ±10 V
±5 V or ±10 V
0 V to 2.5 V or
0 V to 5 V
±2.5 V
Evaluation Board
Evaluation Board
Evaluation Board
Controller Board
600 kSPS
600 kSPS
500 kSPS
500 kSPS
±1 LSB
±1 LSB
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
RS-16
RS-16
RS-16
RS-16
NOTES
1R S= SSOP.
2These boards can be used as stand-alone evaluation boards or in conjunction with the EVAL-CONTROL BOARD for evaluation/demonstration purposes.
3This board is a complete unit allowing a PC to control and communicate with all Analog Devices’ evaluation boards ending in the CB designators.
PIN CONFIGURATION
SSOP
VIN2 1
16 AGND
VIN1 2
15 CONTCLK
AVDD 3 AD7889 14 16/14B
VREF 4 TOP VIEW 13 IDLEHI
AGND 5 (Not to Scale) 12 CONVST
STANDBY 6
11 DGND
RFS 7
SDATA 8
10 DVDD
9 SCLK
REV. B PRELIM. 7/97
–5–

5 Page





AD7889 arduino
Preliminary Technical Information
AD7889
Table III. Ideal Input/Output Code Table for the AD7889-2
Analog Input
www.da+tFasShRe–et34/u2.cLoSmB1, 2 (4.998169 V)
+FSR – 5/2 LSBs (4.996948 V)
+FSR – 7/2 LSBs (4.995728 V)
AGND + 5/2 LSB (0.003052 V)
AGND + 3/2 LSB (0.01832 V)
AGND + 1/2 LSB (0.000610 V)
Digital Output
Code Transition
111 . . . 110 to 111 . . . 111
111 . . . 110 to 111 . . . 110
111 . . . 100 to 111 . . . 101
000 . . . 010 to 010 . . . 011
000 . . . 001 to 001 . . . 010
000 . . . 000 to 000 . . . 001
+FSR – 3/2 LSB2, 3 (2.499084 V)
+FSR – 5/2 LSBs (2.498474 V)
+FSR – 7/2 LSBs (2.497864 V)
AGND + 5/2 LSB (0.001526 V)
AGND + 3/2 LSB (0.00916 V)
AGND + 1/2 LSB (0.000305 V)
111 . . . 110 to 111 . . . 111
111 . . . 110 to 111 . . . 110
111 . . . 100 to 111 . . . 101
000 . . . 010 to 010 . . . 011
000 . . . 001 to 001 . . . 010
000 . . . 000 to 000 . . . 001
NOTES
1FSR is full-scale range and is 5 V with VREF = +2.5 V.
21 LSB = FSR/4096 = 1.22 mV (0V to +5V range) and 0.61 mV (0V to 2.5V range)
with VREF = +2.5 V.
3 FSR is full-scale range and is 2.5V with VREF= +2.5 V.
AD7889-3
Figure 5 shows the analog input section for the AD7889-3.
The analog input range is ±2.5 V on the VIN1 input. The VIN2
input can be left unconnected but if it is connected to a poten-
tial then that potential must be AGND. The input resistance
on the VIN1 is 2.75 knominal. As a result, the VIN1 input
should be driven from a low impedance source. The resistor at-
tenuator stage is followed by the high input impedance stage of
the track/hold amplifier. This resistor attenuator stage allows
the input voltage to go to ±7 V without damaging the
AD7889-3.
VREF
VIN1
VIN2*
+2.5
REFERENCE
2k
5.5k
5.5k
TO ADC
REFERENCE
CIRCUITRY
TO HIGH
IMPEDANCE
SHA INPUT
Table IV. Ideal Input/Output Code Table for the AD7889-3
Analog Input
Digital Output
Code Transition
+FSR/2 – 3/2 LSB1, 2 (2.49817)
+FSR/2 – 5/2 LSBs (2.49695)
+FSR/2 – 7/2 LSBs (2.49573)
AGND + 3/2 LSB (0.00183)
AGND + 1/2 LSB (0.00061)
AGND – 1/2 LSB (–0.00061)
AGND – 3/2 LSB (–0.00183)
–FSR/2 + 5/2 LSB (–2.49695)
–FSR/2 + 3/2 LSB (–2.49817)
–FSR/2 + 1/2 LSB (–2.49939)
011 . . . 110 to 011 . . . 111
011 . . . 110 to 011 . . . 110
011 . . . 110 to 011 . . . 101
000 . . . 001 to 000 . . . 010
000 . . . 000 to 000 . . . 001
111 . . . 111 to 000 . . . 000
111 . . . 110 to 111 . . . 111
100 . . . 010 to 100 . . . 011
100 . . . 001 to 100 . . . 010
100 . . . 000 to 100 . . . 001
NOTES
1FSR is full-scale range and is 5 V with VREF = +2.5 V.
21 LSB = FSR/4096 = 1.22 mV with VREF = +2.5 V.
MICROPROCESSOR INTERFACING
The AD7889 features a high speed serial interfaces with four
modes of operation, allowing considerable flexibility in inter-
facing to microprocessor systems.
Figures 6, 7 and 8 show some typical interface circuits between
the AD7889 and popular DSP processors. The
CONVST signal can be generated by a flag pin from
the DSP or by external hardware controlled by a timer.
AD7889 to ADSP-21XX Interface
Figure 6 shows a serial interface between the AD7889 and the
ADSP-21XX family of DSP processors. TheAD7889 is operat-
ing in Mode A (maximum throughput) and the RFS and
SCLK signals are inputs to the DSP. The flag pin FL0 (con-
trolled by an internal timer routine) is used to provide the
CONVST. Pulsing CONVST starts conversion and data is
provided on the subsequent clock edges.
ADSP-21XX
AD7889
FL0
SCLK0
. DR0
RFS0
CONVST
SCLK
SDATA
RFS
Figure 6. AD7889 to ADSP-21XX Interface
AGND
VIN2* IS UNCONNECTED INTERNALLY ON THE AD7889-3
Figure 5. AD7889-3 Analog Input Structure
The designed code transitions occur midway between succes-
sive integer LSB values (i.e., 1/2 LSB, 3/2 LSBs, 5/2 LSBs).
Output coding is 2s complement binary with 1 LSB = FSR/
4096 = 5 V/4096 = 1.22 mV with VREF = +2.5 V. The ideal
input/output transfer function for the AD7889-3 is shown in
Table IV.
REV. B PRELIM. 7/97
–11–

11 Page







PáginasTotal 12 Páginas
PDF Descargar[ Datasheet AD7889.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
AD7880LC2MOS Single +5 V Supply/ Low Power/ 12-Bit Sampling ADCAnalog Devices
Analog Devices
AD7883LC2MOS 12-Bit/ 3.3 V Sampling ADCAnalog Devices
Analog Devices
AD7884LC2MOS 16-Bit/ High Speed Sampling ADCsAnalog Devices
Analog Devices
AD7885LC2MOS 16-Bit/ High Speed Sampling ADCsAnalog Devices
Analog Devices

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar