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PDF AD7767 Data sheet ( Hoja de datos )
| Número de pieza | AD7767 | |
| Descripción | 128 kSPS/64 kSPS/32 kSPS ADCs | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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24-Bit, 8.5 mW, 109 dB,
128 kSPS/64 kSPS/32 kSPS ADCs
AD7767
FEATURES
Oversampled successive approximation (SAR) architecture
High performance ac and dc accuracy, low power
115.5 dB dynamic range, 32 kSPS (AD7767-2)
112.5 dB dynamic range, 64 kSPS (AD7767-1)
109.5 dB dynamic range, 128 kSPS (AD7767)
−118 dB THD
Exceptionally low power
8.5 mW, 32 kSPS (AD7767-2)
10.5 mW, 64 kSPS (AD7767-1)
15 mW, 128 kSPS (AD7767)
High dc accuracy
24 bits, no missing codes (NMC)
INL: ±3 ppm (typical), ±7.6 ppm (maximum)
Low temperature drift
Zero error drift: 15 nV/°C
Gain error drift: 0.4 ppm/°C
On-chip low-pass FIR filter
Linear phase response
Pass-band ripple: ±0.005 dB
Stop-band attenuation: 100 dB
2.5 V supply with 1.8 V/2.5 V/3 V/3.6 V logic interface options
Flexible interfacing options
Synchronization of multiple devices
Daisy-chain capability
Power-down function
Temperature range: −40°C to +105°C
APPLICATIONS
Low power PCI/USB data acquisition systems
Low power wireless acquisition systems
Vibration analysis
Instrumentation
High precision medical acquisition
FUNCTIONAL BLOCK DIAGRAM
AVDD AGND MCLK DVDD VDRIVE DGND
VREF+
VIN+
VIN–
REFGND
SUCCESSIVE
APPROXIMATION
ADC
DIGITAL
FIR FILTER
AD7767/
AD7767-1/
AD7767-2
SERIAL INTERFACE
AND
CONTROL LOGIC
SCLK DRDY SDO SDI
Figure 1.
SYNC/PD
CS
Rev. C
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.
GENERAL DESCRIPTION
The AD7767/AD7767-1/AD7767-2 are high performance,
24-bit, oversampled SAR analog-to-digital converters (ADCs).
The AD7767/AD7767-1/AD7767-2 combine the benefits of a
large dynamic range and input bandwidth, consuming 15 mW,
10.5 mW, and 8.5 mW power, respectively, and are contained in
a 16-lead TSSOP package.
Ideal for ultralow power data acquisition (such as PCI- and
USB-based systems), the AD7767/AD7767-1/AD7767-2
provide 24-bit resolution. The combination of exceptional SNR,
wide dynamic range, and outstanding dc accuracy make the
AD7767/AD7767-1/AD7767-2 ideally suited for measuring
small signal changes over a wide dynamic range. This is
particularly suitable for applications where small changes on the
input are measured on larger ac or dc signals. In such an
application, the AD7767/AD7767-1/AD7767-2 accurately
gather both ac and dc information.
The AD7767/AD7767-1/AD7767-2 include an on-board digital
filter (complete with linear phase response) that acts to elimi-
nate out-of-band noise by filtering the oversampled input
voltage. The oversampled architecture also reduces front-end
antialias requirements. Other features of the AD7767 include a
SYNC/PD (synchronization/power-down) pin, allowing the
synchronization of multiple AD7767 devices. The addition of
an SDI pin provides the option of daisy chaining multiple
AD7767 devices.
The AD7767/AD7767-1/AD7767-2 operate from a 2.5 V supply
using a 5 V reference. The devices operate from −40°C to +105°C.
RELATED DEVICES
Table 1. 24-Bit ADCs
Part No. Description
AD7760
2.5 MSPS, 100 dB dynamic range,1 on-board differential
amp and reference buffer, parallel, variable decimation
AD7762/
AD7763
625 kSPS, 109 dB dynamic range,1 on-board differential
amp and reference buffer, parallel/serial, variable
decimation
AD7764
312 kSPS, 109 dB dynamic range,1 on-board differential
amp and reference buffer, variable decimation (pin)
AD7765
156 kSPS, 112 dB dynamic range,1 on-board differential
amp and reference buffer, variable decimation (pin)
AD7766 128 kSPS, 109.5 dB,1 15 mW, 16-bit INL, serial interface
AD7766-1 64 kSPS 112.5 dB,110.5 mW, 16-bit INL, serial interface
AD7766-2 32 kSPS, 115.5 dB,1 8.5 mW, 16-bit INL, serial interface
1 Dynamic range at maximum output data rate.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2007–2010 Analog Devices, Inc. All rights reserved.
1 page  
AD7767
Parameter
DIGITAL FILTER RESPONSE1
Group Delay
Settling Time (Latency)
Pass-Band Ripple
Pass Band
−3 dB Bandwidth
Stop-Band Frequency
Stop-Band Attenuation
REFERENCE INPUT1
VREF+ Input Voltage
DIGITAL INPUTS (Logic Levels)1
VIL
VIH
Input Leakage Current
Input Capacitance
Master Clock Rate
Serial Clock Rate
DIGITAL OUTPUTS1
Data Format
VOL
VOH
POWER REQUIREMENTS1
AVDD
DVDD
VDRIVE
CURRENT SPECIFICATIONS
AD7767 Operational Current
AIDD
DIDD
IREF
AD7767-1 Operational Current
AIDD
DIDD
IREF
AD7767-2 Operational Current
AIDD
DIDD
IREF
Static Current with MCLK Stopped
AIDD
DIDD
Power-Down Mode Current
AIDD
DIDD
POWER DISSIPATION
AD7767 Operational Power
AD7767-1 Operational Power
AD7767-2 Operational Power
Test Conditions/Comments
Complete settling
Serial 24 bits, twos complement (MSB
first)
ISINK = +500 μA
ISOURCE = −500 μA
± 5%
± 5%
MCLK = 1.024 MHz
128 kHz output data rate
64 kHz output data rate
32 kHz output data rate
For all devices
For all devices
MCLK = 1.024 MHz
128 kHz output data rate
64 kHz output data rate
32 kHz output data rate
1 Specifications are for all devices, AD7767, AD7767-1, and AD7767-2.
2 See the Terminology section.
Min Typ
Max Unit
37/ODR
μs
74/ODR
μs
±0.005
dB
0.453 × ODR
Hz
0.49 × ODR
Hz
0.547 × ODR
Hz
100 dB
2.4
2 × AVDD
V
−0.3
0.7 × VDRIVE
5
+0.3 × VDRIVE
VDRIVE + 0.3
±1
1.024
1/t8
V
V
μA/pin
pF
MHz
Hz
VDRIVE – 0.3
2.5
2.5
1.7 2.5
1.3
3.9
0.35
1.3
2.2
0.35
1.3
1.37
0.35
0.9
1
0.1
1
15
10.5
8.5
0.4
3.6
1.5
4.8
0.425
1.5
2.85
0.425
1.5
1.86
0.425
1
93
6
93
18
13
10.5
V
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
μA
μA
μA
mW
mW
mW
Rev. C | Page 4 of 24
5 Page 
AD7767
TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = DVDD = 2.5 V ± 5%, VDRIVE = 1.8 V to 3.6 V, VREF = 5 V, MCLK = 1 MHz, common-mode input = VREF/2. TA = 25°C, unless
otherwise noted. All FFTs were generated using 8192 samples using a four-term Blackman-Harris window.
00
–20 –20
–40 –40
–60 –60
–80 –80
–100
–100
–120
–120
–140
–140
–160
–160
–180
0
8k 16k 24k 32k 40k 48k 56k
FREQUENCY (Hz)
Figure 7. AD7767 FFT, 1 kHz, −0.5 dB Input Tone
64k
–180
0
8k 16k 24k 32k 40k 48k 56k
FREQUENCY (Hz)
Figure 10. AD7767 FFT, 1 kHz, −6 dB Input Tone
64k
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0
4k 8k 12k 16k 20k 24k 28k
FREQUENCY (Hz)
Figure 8. AD7767-1 FFT, 1 kHz, −0.5 dB Input Tone
32k
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0
4k 8k 12k 16k 20k 24k 28k
FREQUENCY (Hz)
Figure 11. AD7767-1 FFT, 1 kHz, −6 dB Input Tone
32k
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0
4k 8k 12k
FREQUENCY (Hz)
Figure 9. AD7767-2 FFT, 1 kHz, −0.5 dB Input Tone
16k
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
0
4k 8k 12k
FREQUENCY (Hz)
Figure 12. AD7767-2 FFT, 1 kHz, −6 dB Input Tone
16k
Rev. C | Page 10 of 24
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AD7767.PDF ] | |
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