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PDF AD7605-4 Data sheet ( Hoja de datos )
| Número de pieza | AD7605-4 | |
| Descripción | Simultaneous Sampling ADC | |
| Fabricantes | Analog Devices | |
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Data Sheet
4-Channel DAS with 16-Bit, Bipolar Input,
Simultaneous Sampling ADC
AD7605-4
FEATURES
4 simultaneously sampled inputs
True bipolar analog input ranges: ±10 V (maximum),
±5 V (maximum)
Single 5 V analog supply and 2.5 V to 5 V VDRIVE (nominal)
Fully integrated data acquisition solution
Analog input clamp protection
Input buffer with 1 MΩ analog input impedance
Second-order antialiasing analog filter
On-chip accurate reference and reference buffer
16-bit ADC with 300 kSPS on all channels
Flexible parallel/serial interface
Serial peripheral interface (SPI)/QSPI/MICROWIRE/DSP
compatible
Performance
7 kV ESD rating on analog input pins
Standby mode: 25 mW (typical)
64-lead LQFP package
APPLICATIONS
Power line monitoring and protection systems
Multiphase motor control
Instrumentation and control systems
Multiaxis positioning systems
Data acquisition systems (DAS)
GENERAL DESCRIPTION
The AD7605-41 is a 4-channel, 16-bit, simultaneous sampling,
analog-to-digital data acquisition system (DAS). The device
contains analog input clamp protection, a second-order antialias-
ing filter, a track-and-hold amplifier, a 16-bit charge redistribution
successive approximation analog-to-digital converter (ADC), a
2.5 V reference and reference buffer, and high speed serial and
parallel interfaces.
The AD7605-4 operates from a single 5 V supply and can
accommodate ±10 V and ±5 V true bipolar input signals while
sampling at throughput rates of up to 300 kSPS for all channels.
The input clamp protection circuitry can tolerate voltages up to
±16.5 V. The AD7605-4 has 1 MΩ analog input impedance,
regardless of sampling frequency. The single-supply operation,
on-chip filtering, and high input impedance eliminate the need
for driver op amps and external bipolar supplies.
The AD7605-4 is SPI, QSPI™, MICROWIRE™, and digital signal
processor (DSP) compatible.
Table 1. High Resolution, Bipolar Input, Simultaneous
Sampling DAS Solutions
Resolution Single-Ended True Differential No. of Simultaneous
(Bits)
Inputs
Inputs
Sampling Channels
18
AD7608
AD7609
8
16 AD7606
8
AD7606-6
6
AD7606-4
4
AD7605-4
4
14 AD7607
8
FUNCTIONAL BLOCK DIAGRAM
AVCC AVCC
REGCAP REGCAP REFCAPB REFCAPA
V1
V1GND
V2
V2GND
V3
V3GND
V4
V4GND
CLAMP 1MΩ
CLAMP
1MΩ
1MΩ
CLAMP
CLAMP
1MΩ
1MΩ
CLAMP
CLAMP
1MΩ
1MΩ
CLAMP
CLAMP
1MΩ
RFB
RFB
SECOND-
ORDER LPF
T/H
RFB
RFB
SECOND-
ORDER LPF
T/H
RFB
RFB
SECOND-
ORDER LPF
T/H
RFB
RFB
SECOND-
ORDER LPF
T/H
2.5V
LDO
2.5V
LDO
4:1
MUX
16-BIT
SAR
2.5V
REF
SERIAL
PARALLEL/
SERIAL
INTERFACE
REFIN/REFOUT
REF SELECT
AGND
DB7/DOUTA
DB8/DOUTB
RD/SCLK
CS
PAR/SER/BYTE SEL
VDRIVE
AD7605-4
CLK OSC
CONTROL
INPUTS
PARALLEL
DB0 TO DB15/BYTESEL
BUSY
FRSTDATA
1 Protected by U.S. Patent No. 8,072,360 B2.
AGND
CONVST A CONVST B RESET RANGE
Figure 1.
Rev. 0
Document Feedback
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD7605-4
Data Sheet
Parameter
ANALOG INPUT
Input Voltage Range
Analog Input Current
Input Capacitance
Input Impedance
REFERENCE INPUT/OUTPUT
Reference Input Voltage Range
DC Leakage Current
Input Capacitance
Reference Output Voltage
Reference Temperature Coefficient
LOGIC INPUTS
Input Voltage
High (VINH)
Low (VINL)
Input Current (IIN)
Input Capacitance (CIN)
LOGIC OUTPUTS
Output Voltage
High (VOH)
Low (VOL)
Floating State
Leakage Current
Output Capacitance
Output Coding
CONVERSION RATE
Conversion Time
Track-and-Hold Acquisition Time
Throughput Rate
POWER REQUIREMENTS
AVCC
VDRIVE
Total Current, ITOTAL
Normal Mode
Static
Operational
Standby Mode
Shutdown Mode
Power Dissipation
Normal Mode
Static
Operational
Standby Mode
Shutdown Mode
Test Conditions/Comments
RANGE = 1
RANGE = 0
Input voltage (VIN) = 10 V
VIN = 5 V
REF SELECT = 1
REFIN/REFOUT
ISOURCE = 100 µA
ISINK = 100 µA
Twos complement
All four channels included
Per channel, all four channels included
2.5 V to 5 V nominal
Digital inputs = 0 V or VDRIVE
fSAMPLE = 300 kSPS
fSAMPLE = 300 kSPS
Min
2.475
Typ Max
±10
±5
9
2.5
5
1
2.5
7.5
2.49 to
2.505
±10
2.525
±1
Unit
V
V
µA
µA
pF
MΩ
V
µA
pF
V
ppm/°C
0.7 × VDRIVE
5
0.3 × VDRIVE
±2
V
V
µA
pF
VDRIVE − 0.2
±1
5
16
2
1
300
4.75 5
2.3
0.2
±20
5.25
5.25
V
V
µA
pF
Bits
µs
µs
kSPS
V
V
10 12
12 15.2
58
26
mA
mA
mA
µA
52 61
71 80
25 42
10 31.5
mW
mW
mW
µW
1 LSB means least significant bit. With a ±5 V input range, 1 LSB = 152.58 µV. With a ±10 V input range, 1 LSB = 305.175 µV.
Rev. 0 | Page 4 of 27
5 Page 
AD7605-4
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Data Sheet
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
ANALOG INPUT
DECOUPLING CAPACITOR PIN
POWER SUPPLY
AVCC 1
AGND 2
AGND 3
AGND 4
GROUND PIN
AGND 5
DIGITAL OUTPUT
PAR/SER/BYTE SEL 6
DIGITAL INPUT
REFERENCE INPUT/OUTPUT
STBY 7
RANGE 8
CONVST A 9
CONVST B 10
RESET 11
RD/SCLK 12
CS 13
BUSY 14
FRSTDATA 15
DB0 16
PIN 1
AD7605-4
TOP VIEW
(Not to Scale)
48 AVCC
47 AGND
46 REFGND
45 REFCAPB
44 REFCAPA
43 REFGND
42 REFIN/REFOUT
41 AGND
40 AGND
39 REGCAP
38 AVCC
37 AVCC
36 REGCAP
35 AGND
34 REF SELECT
33 DB15/BYTE SEL
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Figure 8. Pin Configuration
Table 6. Pin Function Descriptions1
Pin No.
Type2
Mnemonic
1, 37, 38, P
48
AVCC
2, 3, 4, 5, GND
26, 35, 40,
41, 47
AGND
6 DI PAR/SER/
BYTE SEL
7 DI STBY
8 DI RANGE
Description
Analog Supply Voltage, 4.75 V to 5.25 V. This supply voltage is applied to the internal front-end
amplifiers and to the ADC core. Decouple these supply pins to AGND.
Analog Ground. These pins are the ground reference points for all analog circuitry on the AD7605-4.
Refer all analog input signals and external reference signals to these pins. Connect all AGND pins to
the AGND plane of a system.
Parallel Interface Selection Input (PAR). This pin is a logic input. If this pin is tied to a logic low, the
parallel interface is selected. Parallel byte interface mode is selected when this pin is logic high and
DB15/BYTE SEL is logic high (see Table 8).
Serial Interface Selection Input (SER). If this pin is tied to a logic high, the serial interface is selected.
In serial mode, the RD/SCLK pin functions as the serial clock input. The DB7/DOUTA pin and the
DB8/DOUTB pin function as serial data outputs. When the serial interface is selected, tie the parallel
output data bit pins (Pin 16 to Pin 22, and Pin 27 to Pin 33) to ground.
Parallel Byte Interface Selection Input (BYTE SEL). In byte mode, DB15/BYTE SEL, in conjunction
with PAR/SER/BYTE SEL, selects the parallel byte mode of operation (see Table 8). DB14/HBEN
functions as the high byte enable (HBEN) pin. DB7 to DB0 transfer the 16-bit conversion results in
two RD/SCLK operations, with DB0 as the LSB of the data transfers.
Standby Mode Input. This pin places the AD7605-4 into one of two power-down modes: standby
mode or shutdown mode. The power-down mode entered depends on the state of the RANGE pin, as
shown in Table 7. When in standby mode, all circuitry, except the on-chip reference, regulators, and
regulator buffers, is powered down. When in shutdown mode, all circuitry is powered down.
Analog Input Range Selection. RANGE is a logic input. The polarity on this pin determines the input
range of the analog input channels. If this pin is tied to a logic high, the analog input range is ±10 V
for all channels. If this pin is tied to a logic low, the analog input range is ±5 V for all channels. A logic
change on this pin has an immediate effect on the analog input range. Changing this pin during a
conversion is not recommended for fast throughput rate applications. See the Analog Input
section for more information.
Rev. 0 | Page 10 of 27
11 Page | ||
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| PDF Descargar | [ Datasheet AD7605-4.PDF ] | |
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