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ADCS7476, ADCS7477, ADCS7478
SNAS192G – APRIL 2003 – REVISED MAY 2016
ADCS747x 1-MSPS, 12-Bit, 10-Bit, and 8-Bit A/D Converters
1 Features
•
•
•
•
•
1
3 Description
The ADCS7476, ADCS7477, and ADCS7478 devices
are low power, monolithic CMOS 12-, 10-, and 8-bit
analog-to-digital converters that operate at 1 MSPS.
The ADCS747x devices are a drop-in replacement for
Analog Device's AD747x. Each device is based on a
successive approximation register architecture with
internal track-and-hold. The serial interface is
compatible with several standards, such as SPI,
QSPI, MICROWIRE, and many common DSP serial
interfaces.
The ADCS747x uses the supply voltage as a
reference, enabling the device to operate with a full-
scale input range of 0 to V
DD
. The conversion rate is
determined from the serial clock (SCLK) speed.
These converters offer a shutdown mode, which can
be used to trade throughput for power consumption.
The ADCS747x is operated with a single supply that
can range from 2.7 V to 5.25 V. Normal power
consumption during continuous conversion, using a
3-V or 5-V supply, is 2 mW or 10 mW respectively.
The power-down feature, which is enabled by a chip
select (CS) pin, reduces the power consumption to
under 5 µW using a 5-V supply. All three converters
are available in a 6-pin SOT-23 package, which
provides an extremely small footprint for applications
where space is a critical consideration. These
products are designed for operation over the
automotive and extended industrial temperature
range of
−40°C
to 125°C.
Device Information
(1)
PART NUMBER
ADCS7476
ADCS7477
ADCS7478
PACKAGE
SOT-23 (6)
BODY SIZE (NOM)
1.60 mm × 2.90 mm
•
Variable Power Management
Packaged in 6-Pin SOT-23
Power Supply Used as Reference
Single 2.7-V to 5.25-V Supply Operation
Compatible With SPI™, QSPI™, MICROWIRE™,
and DSP
Key Specifications
– Resolution With No Missing Codes (12-Bit, 10-
Bit, and 8-Bit)
– Conversion Rate: 1 MSPS
– DNL: 0.5, –0.3 LSB (Typical)
– INL: ±0.4 LSB (Typical)
– Power Consumption:
– 3-V Supply: 2 mW (Typical)
– 5-V Supply: 10 mW (Typical)
2 Applications
•
•
•
•
•
•
Automotive Navigation
FA or ATM Equipment
Portable Systems
Medical Instruments
Mobile Communications
Instrumentation and Control Systems
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Block Diagram
V
IN
T/H
SUCCESSIVE
APPROXIMATION
ADC
ADCS7476
ADCS7477
ACDS7478
SCLK
CONTROL
LOGIC
CS
SDATA
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
ADCS7476, ADCS7477, ADCS7478
SNAS192G – APRIL 2003 – REVISED MAY 2016
www.ti.com
Table of Contents
1
2
3
4
5
6
Features
..................................................................
Applications
...........................................................
Description
.............................................................
Revision History.....................................................
Pin Configuration and Functions
.........................
Specifications.........................................................
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
1
1
1
2
3
4
7.4 Device Functional Modes........................................
17
8
Application and Implementation
........................
21
8.1 Application Information............................................
21
8.2 Typical Application ..................................................
22
9
Power Supply Recommendations......................
23
9.1 Power Supply Noise...............................................
23
9.2 Digital Output Effect Upon Noise ...........................
23
9.3 Power Management ................................................
23
Absolute Maximum Ratings ......................................
4
ESD Ratings..............................................................
4
Recommended Operating Conditions.......................
4
Thermal Information .................................................
4
Electrical Characteristics – ADCS7476.....................
5
Electrical Characteristics – ADCS7477.....................
6
Electrical Characteristics – ADCS7478.....................
8
Timing Requirements ................................................
9
Typical Characteristics ............................................
12
10 Layout...................................................................
24
10.1 Layout Guidelines .................................................
24
10.2 Layout Example ...................................................
25
11 Device and Documentation Support
.................
26
11.1
11.2
11.3
11.4
11.5
Device Support......................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
26
27
27
27
27
7
Detailed Description
............................................
16
7.1 Overview .................................................................
16
7.2 Functional Block Diagram .......................................
16
7.3 Feature Description.................................................
16
12 Mechanical, Packaging, and Orderable
Information
...........................................................
27
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (March 2013) to Revision G
•
Page
Added
ESD Ratings
table,
Feature Description
section,
Device Functional Modes, Application and Implementation
section,
Power Supply Recommendations
section,
Layout
section,
Device and Documentation Support
section, and
Mechanical, Packaging, and Orderable Information
section ..................................................................................................
1
Moved V
DD
from the
Electrical Characteristics
tables to the
Recommended Operating Conditions
table .............................
5
Page
•
Changes from Revision E (March 2013) to Revision F
•
Changed layout of National Data Sheet to TI format .............................................................................................................
1
2
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Copyright © 2003–2016, Texas Instruments Incorporated
Product Folder Links:
ADCS7476 ADCS7477 ADCS7478
ADCS7476, ADCS7477, ADCS7478
www.ti.com
SNAS192G – APRIL 2003 – REVISED MAY 2016
5 Pin Configuration and Functions
DBV Package
6-Pin SOT-23
Top View
VDD
GND
VIN
1
2
3
6
5
4
CS
SDATA
SCLK
Not to scale
Pin Functions
PIN
NO.
1
2
3
4
5
6
(1)
NAME
V
DD
GND
V
IN
SCLK
SDATA
CS
TYPE
(1)
DESCRIPTION
Positive supply pin. These pins must be connected to a quiet 2.7-V to 5.25-V source and bypassed
to GND with 0.1-µF and 1-µF monolithic capacitors placed within 1 cm of the power pin. ADCS747x
uses this power supply as a reference, so it must be thoroughly bypassed.
The ground return for the supply.
Analog input. This signal can range from 0 V to V
DD
.
Digital clock input. The range of frequencies for this input is 10 kHz to 20 MHz, with ensured
performance at 20 MHz. This clock directly controls the conversion and readout processes.
Digital data output. The output words are clocked out of this pin by the SCLK pin.
Chip select. A conversion process begins on the falling edge of CS.
P
G
I
I
O
I
G = Ground, I = Input, O = Output, P = Power
Copyright © 2003–2016, Texas Instruments Incorporated
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Product Folder Links:
ADCS7476 ADCS7477 ADCS7478
ADCS7476, ADCS7477, ADCS7478
SNAS192G – APRIL 2003 – REVISED MAY 2016
www.ti.com
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
(1) (2)
MIN
Supply voltage, V
DD
Voltage on any analog pin to GND
Voltage on any digital pin to GND
Input current at any pin (except power supply pins)
Soldering temperature, infrared (10 sec)
Operating temperature, T
A
Storage temperature, T
stg
(1)
(2)
–65
–0.3
–0.3
–0.3
MAX
6.5
V
DD
+ 0.3
6.5
±10
215
150
150
UNIT
V
V
V
mA
°C
°C
°C
Stresses beyond those listed under
Absolute Maximum Ratings
may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under
Recommended
Operating Conditions.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
6.2 ESD Ratings
VALUE
V
(ESD)
(1)
(2)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001
(1)
Charged-device model (CDM), per JEDEC specification JESD22-C101
(2)
UNIT
V
±3500
±200
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
V
DD
T
A
Supply voltage
Digital input pins voltage (independent of supply voltage)
Operating temperature
2.7
2.7
–40
MAX
5.25
5.25
125
UNIT
V
V
°C
6.4 Thermal Information
THERMAL METRIC
(1)
ADCS7476,
ADCS7477,
ADCS7478
DBV (SOT-23)
6 PINS
R
θJA
R
θJC(top)
R
θJB
ψ
JT
ψ
JB
(1)
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
184.5
151.2
29.7
29.8
29.1
°C/W
°C/W
°C/W
°C/W
°C/W
UNIT
For more information about traditional and new thermal metrics, see the
Semiconductor and IC Package Thermal Metrics
application
report,
SPRA953.
4
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Product Folder Links:
ADCS7476 ADCS7477 ADCS7478
ADCS7476, ADCS7477, ADCS7478
www.ti.com
SNAS192G – APRIL 2003 – REVISED MAY 2016
6.5 Electrical Characteristics – ADCS7476
T
A
= 25°C, V
DD
= 2.7 V to 5.25 V, f
SCLK
= 20 MHz, and f
SAMPLE
= 1 MSPS (unless otherwise noted)
(1)
PARAMETER
STATIC CONVERTER CHARACTERISTICS
Resolution with no missing codes
INL
Integral non-linearity
V
DD
= 2.7 V to 3.6 V, –40°C
≤
T
A
≤
125°C
V
DD
= 2.7 V to 3.6 V
T
A
= 25°C
–40°C
≤
T
A
≤
85°C
–1.1
–0.3
–0.9
±0.1
±1.2
±0.2
±1.2
72
70
72.5
70.8
70.6
–80
82
–78
–78
11
8
2
1
2
3.5
0.6
1.6
0.5
60
T
A
= 25°C
–40°C
≤
T
A
≤
85°C
T
A
= 25°C
–40°C
≤
T
A
≤
85°C
2.5
1.5
0 to V
DD
–40°C
≤
T
A
≤
85°C
30
±1
2
4.8
10
17.5
0.5
1
±1
T
A
= 25°C
–40°C
≤
T
A
≤
85°C
T
A
= 25°C
−40°C ≤
T
A
≤
125°C
T
A
= 25°C
–40°C
≤
T
A
≤
125°C
T
A
= 25°C
–40°C
≤
T
A
≤
125°C
T
A
= 25°C
–40°C
≤
T
A
≤
85°C
±0.4
±1
1
12
Bits
LSB
LSB
LSB
LSB
LSB
LSB
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
DD
= 2.7 V to 3.6 V, T
A
= 125°C
DNL
Differential non-linearity
V
DD
= 2.7 V to 3.6 V
V
DD
= 2.7 V to 3.6 V, T
A
= 125°C
V
OFF
GE
Offset error
Gain error
V
DD
= 2.7 V to 3.6 V
V
DD
= 2.7 V to 3.6 V
DYNAMIC CONVERTER CHARACTERISTICS
SINAD
Signal-to-noise plus distortion ratio f
IN
= 100 kHz
f
IN
= 100 kHz
f
IN
= 100 kHz, T
A
= 125°C
THD
SFDR
Total harmonic distortion
Spurious-free dynamic range
Intermodulation distortion,
second order terms
Intermodulation distortion,
third order terms
–3-dB full power bandwidth
f
IN
= 100 kHz
f
IN
= 100 kHz
f
a
= 103.5 kHz, f
b
= 113.5 kHz
f
a
= 103.5 kHz, f
b
= 113.5 kHz
5-V supply
3-V supply
V
DD
= 4.75 V to 5.25 V, SCLK On or Off
V
DD
= 2.7 V to 3.6 V, SCLK On or Off
V
DD
= 4.75 V to 5.25 V,
f
SAMPLE
= 1 MSPS
I
DD
Normal mode (operational)
V
DD
= 2.7 V to 3.6 V,
f
SAMPLE
= 1 MSPS
Shutdown mode
V
DD
= 5 V, SCLK Off
V
DD
= 5 V, SCLK On
V
DD
= 5 V,
f
SAMPLE
= 1 MSPS
V
DD
= 3 V,
f
SAMPLE
= 1 MSPS
V
DD
= 5 V, SCLK Off
V
DD
= 3 V, SCLK Off
T
A
= 25°C
–40°C
≤
T
A
≤
85°C
T
A
= 25°C
–40°C
≤
T
A
≤
85°C
dB
dB
dB
dB
dB
dB
dB
MHz
MHz
mA
mA
mA
mA
µA
µA
mW
mW
µW
µW
V
µA
pF
SNR
Signal-to-noise ratio
IMD
FPBW
POWER SUPPLY CHARACTERISTICS
Normal mode (static)
Power consumption,
normal mode (operational)
P
D
Power consumption,
shutdown mode
ANALOG INPUT CHARACTERISTICS
V
IN
I
DCL
C
INA
Input range
DC leakage current
Analog input capacitance
DIGITAL INPUT CHARACTERISTICS
(1)
Data sheet minimum and maximum specification limits are ensured by design, test, or statistical analysis.
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