ADC161S626 Datasheet PDF - National Semiconductor

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ADC161S626
National Semiconductor

Part Number ADC161S626
Description MicroPower ADC
Page 22 Pages


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ADC161S626
May 14, 2009
16-Bit, 50 to 250 kSPS, Differential Input, MicroPower ADC
General Description
The ADC161S626 is a 16-bit successive-approximation reg-
ister (SAR) Analog-to-Digital converter (ADC) with a maxi-
mum sampling rate of 250 kSPS. The ADC161S626 has a
minimum signal span accuracy of ± 0.003% over the temper-
ate range of −40°C to +85°C. The converter features a differ-
ential analog input with an excellent common-mode signal
rejection ratio of 85 dB, making the ADC161S626 suitable for
noisy environments.
The ADC161S626 operates with a single analog supply (VA)
and a separate digital input/output (VIO) supply. VA can range
from +4.5V to +5.5V and VIO can range from +2.7V to +5.5V.
This allows a system designer to maximize performance and
minimize power consumption by operating the analog portion
of the ADC at a VA of +5V while interfacing with a +3.3V con-
troller. The serial data output is binary 2's complement and is
SPI™ compatible.
The performance of the ADC161S626 is guaranteed over
temperature at clock rates of 1 MHz to 5 MHz and reference
voltages of +2.5V to +5.5V. The ADC161S626 is available in
a small 10-lead MSOP package. The high accuracy, differ-
ential input, low power consumption, and small size make the
ADC161S626 ideal for direct connection to bridge sensors
and transducers in battery operated systems or remote data
acquisition applications.
Applications
Direct Sensor Interface
I/O Modules
Data Acquisition
Portable Systems
Motor Control
Medical Instruments
Instrumentation and Control Systems
Features
16-bit resolution with no missing codes
Guaranteed performance from 50 to 250 kSPS
±0.003% signal span accuracy
Separate Digital Input/Output Supply
True differential input
External voltage reference range of +0.5V to VA
Zero-Power Track Mode with 0 µsec wake-up delay
Wide input common-mode voltage range of 0V to VA
SPI™/QSPI™/MICROWIRE™ compatible Serial
Interface
Operating temperature range of −40°C to +85°C
Small MSOP-10 package
Key Specifications
Conversion Rate
DNL
INL
Offset Error Temp Drift
Gain Error Temp Drift
SNR
THD
Power Consumption
10 kSPS, 5V
200 kSPS, 5V
250 kSPS, 5V
Power-Down, 5V
50 kSPS to 250 kSPS
+ 0.8 / − 0.5 LSB
± 0.8 LSB
2.5 µV/°C
0.3 ppm/°C
93.2 dBc
− 104 dBc
0.24 mW
5.3 mW
5.8 mW
10 µW
Typical Application
TRI-STATE® is a trademark of National Semiconductor Corporation.
MICROWIRE™ is a trademark of National Semiconductor Corporation.
QSPI™ and SPI™ are trademarks of Motorola, Inc.
© 2009 National Semiconductor Corporation 300734
30073482
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Ordering Information
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Order Code
Temperature Range
ADC161S626CIMM
−40°C to +85°C
ADC161S626CIMMX
−40°C to +85°C
ADC161S626CIMME
−40°C to +85°C
ADC161S626EB
Description
10-Lead MSOP Package, 1000 Units Tape & Reel
10-Lead MSOP Package, 3500 Units Tape & Reel
10-Lead MSOP Package, 250 Units Tape & Reel
Evaluation Board
Top Mark
X98C
X98C
X98C
Block Diagram
Connection Diagram
30073405
Pin Descriptions
30073402
Pin No.
1
2
3
4
5
6
7
8
9
10
Symbol
VREF
+IN
−IN
GND
GND
CS
DOUT
SCLK
VIO
VA
Description
Voltage Reference
+0.5V < VREF < VA
Non-Inverting Input
Inverting Input
Ground
Ground
Chip Select Bar
Serial Data Output
Serial Clock
Digital Input/Output Power
+2.7V < VREF < +5.5V
Analog Power
+4.5V < VREF < +5.5V
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wwAwb.DsatoaSlhueette4UM.coamximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Analog Supply Voltage VA
Digital I/O Supply Voltage VIO
Voltage on Any Analog Input Pin to
GND
Voltage on Any Digital Input Pin to
GND
Input Current at Any Pin (Note 3)
Package Input Current (Note 3)
Power Consumption at TA = 25°C
ESD Susceptibility (Note 5)
Human Body Model
Machine Model
Charge Device Model
Junction Temperature
Storage Temperature
−0.3V to 6.5V
−0.3V to 6.5V
−0.3V to (VA + 0.3V)
−0.3V to (VIO + 0.3V)
±10 mA
±50 mA
See (Note 4)
2500V
250V
1250V
+150°C
−65°C to +150°C
Operating Ratings (Notes 1, 2)
Operating Temperature Range
−40°C TA +85°C
Supply Voltage, VA
+4.5V to +5.5V
Supply Voltage, VIO
+2.7V to +5.5V
Reference Voltage, VREF
+0.5V to VA
Analog Input Pins Voltage Range
0V to VA
Differential Analog Input Voltage
−VREF to +VREF
Input Common-Mode Voltage, VCM See Figure 10 (Sect 2.3)
Digital Input Pins Voltage Range
0V to VIO
Clock Frequency
1 MHz to 5 MHz
Package Thermal Resistance
Package
θJA
10-lead MSOP
240°C / W
Soldering process must comply with National
Semiconductor's Reflow Temperature Profile specifications.
Refer to www.national.com/packaging. (Note 6)
ADC161S626 Converter Electrical Characteristics (Note 7)
The following specifications apply for VA = 4.5V to 5.5V, VIO = 2.7V to 5.5V, and VREF = 2.5V to 5.5V for fSCLK = 1 MHz to 4 MHz
or VREF = 4.5V to 5.5V for fSCLK = 1 MHz to 5 MHz; fIN = 20 kHz, and CL = 25 pF, unless otherwise noted. Maximum and minimum
values apply for TA = TMIN to TMAX; the typical values are tested at TA = 25°C.
Symbol
Parameter
Conditions
Min Typ Max Units
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes
16 Bits
DNL
Differential Non-Linearity
−1 -0.5/+0.8 +2
LSB
INL Integral Non-Linearity
−2 ±0.8 +2 LSB
OE Offset Error
OEDRIFT
FSE
Offset Error Temperature Drift
Positive Full-Scale Error
Negative Full-Scale Error
VREF = 2.5V
VREF = 5V
VREF = 2.5V
VREF = 5V
−1 −0.1 +1 mV
−0.4
mV
3.7 µV/°C
2.5 µV/°C
−0.003
±0.03 %FS
−0.002
±0.03 %FS
Positive Gain Error
GE
Negative Gain Error
−0.002
−0.0001
±0.02
±0.02
%FS
%FS
GEDRIFT Gain Error Temperature Drift
0.3
ppm/°
C
DYNAMIC CONVERTER CHARACTERISTICS
SINAD
SNR
THD
SFDR
ENOB
FPBW
Signal-to-Noise Plus Distortion Ratio
Signal-to-Noise Ratio
Total Harmonic Distortion
Spurious-Free Dynamic Range
Effective Number of Bits
−3 dB Full Power Bandwidth
VREF = 2.5V
VREF = 4.5V to 5.5V
VREF = 2.5V
VREF = 4.5V to 5.5V
VREF = 2.5V
VREF = 4.5V to 5.5V
VREF = 2.5V
VREF = 4.5V to 5.5V
VREF = 2.5V
VREF = 4.5V to 5.5V
Output at 70.7%FS with FS
Differential Input
85
89
85
89
13.8
14.5
88
93.0
88
93.2
−104
−106
108
111
14.3
15.2
26
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
bits
bits
MHz
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Symbol
Parameter
www.DataSAhNeAeLt4OUG.coINmPUT CHARACTERISTICS
Conditions
Min
VIN Differential Input Range
CS high
−VREF
IINA
CINA
Analog Input Current
Input Capacitance (+IN or −IN)
VREF = 5V, VIN = 0V, fS = 50 kSPS
VREF = 5V, VIN = 0V, fS = 200 kSPS
In Acquisition Mode
In Conversion Mode
CMRR Common Mode Rejection Ratio
See the Specification Definitions for
the test condition
DIGITAL INPUT CHARACTERISTICS
VIH Input High Voltage
VIL Input Low Voltage
IIND Digital Input Current
CIND
Input Capacitance
DIGITAL OUTPUT CHARACTERISTICS
fIN = 0 Hz
fIN = 0 Hz
0.7 x VIO
VOH Output High Voltage
VOL Output Low Voltage
IOZH, IOZL
COUT
TRI-STATE Leakage Current
TRI-STATE Output Capacitance
Output Coding
ISOURCE = 200 µA
ISOURCE = 1 mA
ISOURCE = 200 µA
ISOURCE = 1 mA
Force 0V or VA
Force 0V or VA
VIO − 0.2
POWER SUPPLY CHARACTERISTICS
VA Analog Supply Voltage Range
VIO
Digital Input/Output Supply Voltage
Range
(Note 9)
4.5
2.7
VREF
Reference Voltage Range
IVA (Conv)
Analog Supply Current, Conversion
Mode
VA = 5V, fSCLK = 4 MHz,
fS = 200 kSPS
VA = 5V, fSCLK = 5 MHz,
fS = 250 kSPS
IVIO
(Conv)
Digital I/O Supply Current, Conversion
Mode
VIO = 3V, fSCLK = 4 MHz,
fS = 200 kSPS
VIO = 3V, fSCLK = 5 MHz,
fS = 250 kSPS
IVREF
(Conv)
Reference Current, Conversion Mode
VA = 5V, fSCLK = 4 MHz,
fS = 200 kSPS
VA = 5V, fSCLK = 5 MHz,
fS = 250 kSPS
IVA (PD)
Analog Supply Current, Power Down
Mode (CS high)
fSCLK = 5 MHz, VA = 5V
fSCLK = 0 Hz, VA = 5V (Note 8)
IVIO (PD)
Digital I/O Supply Current, Power Down fSCLK = 5 MHz, VIO = 3V
Mode (CS high)
fSCLK = 0 Hz, VIO = 3V (Note 8)
IVREF (PD)
Reference Current, Power Down Mode
(CS high)
fSCLK = 5 MHz, VREF = 5V
fSCLK = 0 Hz, VREF = 5V (Note 8)
PWR
(Conv)
VA = 5V, fSCLK = 4 MHz, fS = 200
Power Consumption, Conversion Mode kSPS, and fIN = 20 kHz,
VA = 5V, fSCLK = 5 MHz, fS = 250
kSPS, and fIN = 20
0.5
Typ
3.2
10.3
20
4
85
Max Units
+VREF
±1
V
µA
nA
nA
pF
pF
dB
1.9 V
1.7
0.3 x VIO
V
±1 µA
4 pF
VIO − 0.03
VIO − 0.09
0.01
0.4
V
V
V
0.07 V
±1 µA
4 pF
Binary 2'S Complement
5
3
5
1060
5.5 V
5.5 V
VA V
µA
1160
1340
µA
80 µA
100 µA
80 µA
100 170 µA
7 µA
2 3 µA
1 µA
0.3 0.5 µA
0.5 µA
0.5 0.7 µA
5.3 mW
5.8 6.7 mW
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