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PDF AD7915 Data sheet ( Hoja de datos )

Número de pieza AD7915
Descripción 1 MSPS/500 kSPS Differential PulSAR ADCs
Fabricantes Analog Devices　
Logotipo Analog Devices Logotipo



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Data Sheet
16-Bit, 1 MSPS/500 kSPS
Differential PulSAR ADCs
AD7915/AD7916
FEATURES
Low power dissipation
AD7915
4 mW at 1 MSPS (VDD only)
7 mW at 1 MSPS (total)
AD7916
2 mW at 500 kSPS (VDD only)
3.7 mW at 500 kSPS (total)
16-bit resolution with no missing codes
Throughput: 1 MSPS (AD7915)/500 kSPS (AD7916)
INL: ±0.4 LSB typical, ±1 LSB maximum
SNR: 94 dB at 1 kHz, VREF = 5 V
SINAD: 93.5 dB at 1 kHz, VREF = 5 V
THD: −118.5 dB at 1 kHz
Dynamic range: 95.5 dB, VREF = 5 V
True differential analog input range: ±VREF
0 V to VREF with VREF between 2.4 V and 5.1 V
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
interface
Proprietary serial interface: SPI-/QSPI-/MICROWIRE™-/DSP-
compatible1
Ability to daisy-chain multiple ADCs
10-lead packages: MSOP and 3 mm × 3 mm LFCSP
APPLICATIONS
Battery-powered equipment
Data acquisition systems
Medical instruments
Seismic data acquisition systems
GENERAL DESCRIPTION
The AD7915/AD7916 are 16-bit, successive approximation,
analog-to-digital converters (ADCs) that operate from a single
power supply, VDD. They contain a low power, high speed,
16-bit sampling ADC and a versatile serial interface port. On
the CNV rising edge, the AD7915/AD7916 sample the voltage
difference between the IN+ and IN− pins. The voltages on these
pins typically swing in opposite phases between 0 V and VREF.
The reference voltage, REF, is applied externally and can be set
independent of the supply voltage, VDD. The power consumption
of the AD7915/AD7916 scales linearly with throughput.
The AD7915/AD7916 are serial peripheral interface (SPI)
compatible, which features the ability, using the SDI input, to
daisy-chain several ADCs on a single 3-wire bus. They are
compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic using the
separate VIO supply.
The AD7915/AD7916 are available in a 10-lead MSOP or a
10-lead LFCSP with operation specified from −40°C to +125°C.
Table 1. MSOP, LFCSP 14-/16-/18-Bit PulSAR® ADCs
Bits 100 kSPS 250 kSPS 400 kSPS to 500 kSPS ≥1000 kSPS
181 AD7989-12 AD76912 AD76902
AD79822
AD7989-52
AD79842
161 AD7684 AD76872 AD76882
AD79152
AD76932
AD79162
163 AD7680 AD76852 AD76862
AD79802
AD7683 AD7694 AD7988-52
AD79832
AD7988-12
143 AD7940 AD79422 AD79462
1 True differential.
2 Pin-for-pin compatible.
3 Pseudo differential.
TYPICAL APPLICATIONS CIRCUIT
2.5V TO 5V 2.5V
1 Protected by U.S. Patent 6,703,961.
±10V, ±5V, ..
ADA4940-1
REF VDD VIO
IN+ SDI/CS
AD7915/
AD7916
IN–
GND
SCK
SDO
CNV
Figure 1.
1.8V TO 5.5V
3- OR 4-WIRE
INTERFACE
(SPI, CS,
DAISY CHAIN)
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
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com

1 page




AD7915 pdf
Data Sheet
AD7915/AD7916
TIMING SPECIFICATIONS
TA = −40°C to +125°C, VDD = 2.37 V to 2.63 V, VIO = 2.3 V to 5.5 V, CLOAD_SDO = 20 pF, unless otherwise noted. See Figure 2 for voltage levels.
Table 3.
Parameter
AD7915
Throughput Rate
Conversion Time: CNV Rising Edge to Data Available
Acquisition Time
Time Between Conversions
AD7916
Throughput Rate
Conversion Time: CNV Rising Edge to Data Available
Acquisition Time
Time Between Conversions
CNV Pulse Width (CS Mode)
SCK Period (CS Mode)
VIO Above 4.5 V
VIO Above 3 V
VIO Above 2.7 V
VIO Above 2.3 V
SCK Period (Chain Mode)
VIO Above 4.5 V
VIO Above 3 V
VIO Above 2.7 V
VIO Above 2.3 V
SCK Low Time
SCK High Time
SCK Falling Edge to Data Remains Valid
SCK Falling Edge to Data Valid Delay
VIO Above 4.5 V
VIO Above 3 V
VIO Above 2.7 V
VIO Above 2.3 V
CNV or SDI Low to SDO D15 MSB Valid (CS Mode)
VIO Above 3 V
VIO Above 2.3 V
CNV or SDI High or Last SCK Falling Edge to SDO High Impedance (CS Mode)
SDI Valid Setup Time from CNV Rising Edge (CS Mode)
SDI Valid Hold Time from CNV Rising Edge (CS Mode)
SCK Valid Setup Time from CNV Rising Edge (Chain Mode)
SCK Valid Hold Time from CNV Rising Edge (Chain Mode)
SDI Valid Setup Time from SCK Falling Edge (Chain Mode)
SDI Valid Hold Time from SCK Falling Edge (Chain Mode)
SDI High to SDO High (Chain Mode with Busy Indicator)
Symbol
tCONV
tACQ
tCYC
tCONV
tACQ
tCYC
tCNVH
tSCK
tSCK
tSCKL
tSCKH
tHSDO
tDSDO
tEN
tDIS
tSSDICNV
tHSDICNV
tSSCKCNV
tHSCKCNV
tSSDISCK
tHSDISCK
tDSDOSDI
Min Typ Max Unit
1 MSPS
500 710 ns
290 ns
1 μs
500 kSPS
0.5 1.6 μs
400 ns
2 μs
10 ns
10.5 ns
12 ns
13 ns
15 ns
11.5 ns
13 ns
14 ns
16 ns
4.5 ns
4.5 ns
3 ns
9.5 ns
11 ns
12 ns
14 ns
10 ns
15 ns
20 ns
5 ns
2 ns
5 ns
5 ns
2 ns
3 ns
15 ns
X% VIO1
tDELAY
VIH2
VIL2
Y% VIO1
tDELAY
VIH2
VIL2
1FOR VIO ≤ 3.0V, X = 90 AND Y = 10; FOR VIO > 3.0V, X = 70 AND Y = 30.
2MINIMUM VIH AND MAXIMUM VIL USED. SEE THE DIGITAL INPUTS
SPECIFICATIONS IN TABLE 3.
Figure 2. Voltage Levels for Timing
Rev. 0 | Page 5 of 26

5 Page





AD7915 arduino
Data Sheet
0.7
IVDD
0.6
0.5
0.4
0.3
IREF
0.2
IVIO
0.1
0
2.375
2.425
2.475
2.525
VDD VOLTAGE (V)
2.575
2.625
Figure 23. Operating Currents vs. VDD Voltage (AD7916)
0.7
IVDD
0.6
0.5
0.4
0.3
IREF
0.2
IVIO
0.1
0
–55 –35 –15
5 25 45 65
TEMPERATURE (°C)
85 105 125
Figure 24. Operating Currents vs. Temperature (AD7916)
1.4
IVDD
1.2
1.0
0.8
0.6
IREF
0.4
IVIO
0.2
0
2.375
2.425
2.475
2.525
2.575
2.625
VDD VOLTAGE (V)
Figure 25. Operating Currents vs. VDD Voltage (AD7915)
AD7915/AD7916
8
7
6
5
4
3 IVDD + IVIO
2
1
0
–55 –35 –15
5 25 45 65
TEMPERATURE (°C)
85 105 125
Figure 26. Power-Down Currents vs. Temperature
1.4
IVDD
1.2
1.0
0.8
0.6
IREF
0.4
IVIO
0.2
0
–55 –35 –15
5 25 45 65
TEMPERATURE (°C)
85 105 125
Figure 27. Operating Currents vs. Temperature (AD7915)
Rev. 0 | Page 11 of 26

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