8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog PDF

8-Bit to 18-Bit SAR ADCs …
… from the Leader in High Performance Analog
2005–2006 Edition
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2
8-Bit to 18-Bit SAR ADCs with Sample Rates up to 3 MSPS
The latest additions to ADI’s ADC portfolio offer unrivaled functionality in terms
of channel count and power supply voltage, optimal power/speed ratios, and
the smallest packages to meet the demands of any data acquisition application,
including portable, industrial, medical, wireless, and communications.
Up to 2 MSPS Sample Rate,
Up to 6 Channels Simultaneous
Sampling, True Bipolar Input Ranges,
Serial and Parallel Interfaces
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1.6 V to 3.6 V Power
Supply, Up to
200 kSPS Sample Rate,
6-Lead SOT-23 Package,
8-Lead MSOP Package
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Up to 1.5 MSPS Sample Rate,
World’s Fastest 4-Channel
and 8-Channel SAR ADCs
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Up to 188 kSPS Sample
Rate, 2, 4, or 8 Channels,
Standard, Fast, and High
Speed Interface Modes
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Up to 1 MSPS Sample
Rate, Single-Channel,
10-Bit and 12-Bit
Resolutions, 3 V or
5 V Power Supply
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Up to 1 MSPS
Sample Rate,
2.5 V to
10 V Input
Ranges, Serial
and Parallel
Interfaces
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Up to 3 MSPS Sample Rate,
World’s Smallest Package, SC70,
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3 V or 5 V Power Supply
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Up to 3 MSPS Sample Rate,
DNL, 0.5 LSB/0.75 LSB @
12-Bit/14-Bit, Serial and
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Parallel Interfaces
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Up to 2 MSPS Sample Rate,
Up to 16 Channels, 3 V
or 5 V Power Supply
3
Single-Channel Selector Guide
Generic
Resolution
(Bits)
Throughput
(kSPS)
Power
(mW)
AD7450A
12
1,000
4 max
AD7452
12
555
3.3 max
AD7440
10
1,000
4 max
AD7684
16
100
6 max
AD7687
16
250
20
AD7688
16
500
44
Generic
Resolution Throughput Power
(Bits)
(kSPS)
(mW)
AD7683
16
100
6 max
AD7685
16
250
15 max
AD7686
16
500
20
AD7942
14
250
12.5 max
AD7946
14
500
25 max
AD7451
12
1,000
4 max
AD7453
12
555
3.3 max
AD7457
12
100
1 max
AD7441
10
1,000
4 max
Generic
AD7466
AD7467
AD7468
Resolution
(Bits)
12
10
8
Throughput
(kSPS)
200
200
200
Generic
AD7641
AD7621
AD7274
AD7276
AD7476/
AD7476A
AD7920
AD7475
AD7495
AD7277
AD7273
AD7477/
AD7477A
AD7910
AD7278
AD7478/
AD7478A
Generic
AD7472
AD7492
AD7470
Resolution
(Bits)
12
12
10
Power
(mW)
0.3 max
0.2 max
0.2 max
Resolution
(Bits)
18
16
12
12
12
Throughput
(kSPS)
2,000
3,000
3,000
3,000
1,000
Power
(mW)
100
100
12.5
12.5
5.1 max
12
12
12
10
10
10
250
1,000
1,000
3,000
3,000
1,000
4.2 max
4.5 max
6 max
10.5 max
10.5 max
5.1 max
10
8
8
250
3,000
1,000
4.2 max
10.5 max
5.1 max
Throughput
(kSPS)
1,500
1,250
1,750
Power
(mW)
9 max
9 max
4.5 max
At 3 MSPS, New Serial ADCs Break Speed Record—in a Tiny TSOT Package
The need for faster loop settling times, higher channel counts, and reduced package sizes is driving converter technology today. By
combining the latest in process technology with advances in circuit design, ADI has created a new generation of solutions.
The AD727x family of 12-, 10-, and 8-bit SAR ADCs features high speed and low power SAR ADCs. The parts operate from a single
2.35 V to 3.6 V power supply and feature throughput rates up to 3 MSPS. Housed in both the tiny TSOT package and the 8-lead MSOP
package, their conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface
with microprocessors or DSPs.
The conversion rate is determined by the SCLK, with no pipeline delays. They also have the advantage of being pin-compatible with
other popular ADCs from ADI. The AD7276/AD7277/AD7278 are pin-for-pin compatible with the AD7476 and AD7476A families of
converters.
4
World’s Smallest 12-Bit, 10-Bit, and 8-Bit ADCs; SC70 Package Is Half the
Size of the SOT-23 Package
The 18-bit AD794x, 14-bit AD7685, 12-bit AD7476A, and 8-bit AD7478A are SAR
(successive approximation) A/D converters with a maximum throughput rate of 1 MSPS
that consume just 3.6 mW and conveniently come in tiny, 6-lead SC70 packages.
For lower throughput rates, use the AD7910 and AD7920, very low power SAR ADCs
that also come in SC70 packages. The parts are based on the AD747x core, but the
throughput rates have been reduced to 250 kSPS to conserve power.
Features
• Fast throughput rate: 1 MSPS
• Specified for VDD of 2.35 V to 5.25 V
• Low power: 3.6 mW typ at 1 MSPS
with 3 V supplies
• Wide input bandwidth: >13 MHz
• Flexible power/serial clock speed management
• No pipeline delays
• High speed serial interface
• SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
• Standby mode: 1 A max
• 6-lead SC70 and 8-lead MSOP* packages
*MSOP is equivalent to SOIC.
For More Flexible Reference Capability
The AD7475 and AD7495, from the same family of low power, high speed SAR ADCs, are 12-bit, 1 MSPS parts with the addition of a
REFIN and REFOUT pin, respectively, and a logic power supply (VDRIVE) pin. Both are packaged in 8-lead SOIC and MSOP packages; the
AD7475 requires an external reference, while the AD7495 provides its own internal 2.5 V reference. For parallel interface versions, refer
to the AD7470 (10-bit ADC), AD7472, and AD7492, which include an internal reference option and clock oscillator.
When High Performance or Low Noise Matters, Choose ADI’s True
Differential or Pseudo Differential Analog Input ADCs
The AD744x, AD745x, AD768x, and AD794x are families of 10-bit to 16-bit serial
ADCs with throughput rates from 100 kSPS up to 1 MSPS. For true differential inputs,
complementary signals are applied to VIN() and VIN(). Alternatively, in the pseudo
differential case, the VIN() is used as a dc offset.
Features
• Specified for VDD of 3 V and 5 V
• Fully differential or pseudo differential
analog inputs
• Low power at max throughput rate:
3.75 mW at 1 MSPS with 3 V supplies
• Wide input bandwidth: >20 MHz
• Flexible power/serial clock speed
management
• High speed serial interface—
SPI-/QSPI-/MICROWIRE-/DSP-compatible
• Power-down mode: 1 A max
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Applications
• Interface to transducers
• Communications
• Battery-powered systems
• Data acquisition systems
• Motor control
• Portable instrumentation
5
Multichannel Selector Guide
Generic Resolution
(Bits)
Throughput
(kSPS)
Power
(mW)
AD7992 12
188
0.495 max
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Generic
Resolution
(Bits)
Throughput
(kSPS)
Power
(mW)
AD7654
16
500
135 max
AD7922
12
1,000
6 max
AD7921
12
250
6 max
AD7912
10
1,000
6 max
AD7911
10
250
6 max
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Generic
Resolution Throughput Power
(Bits)
(kSPS)
(mW)
AD7993
10
188
0.495 max
AD7994
12
188
0.495 max
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Generic
Resolution Throughput Power
(Bits)
(kSPS)
(mW)
AD7997
10
188
0.495 max
AD7998
12
188
0.495 max
Generic
Resolution
(Bits)
Throughput
(kSPS)
Power
(mW)
AD7655
16
1,000
135 max
AD7924
12
1,000
6 max
AD7923
12
200
3.6 max
AD7914
10
1,000
6 max
AD7904
8
1,000
6 max
Generic
Resolution
(Bits)
Throughput
(kSPS)
Power
(mW)
AD7928
12
1,000
6 max
AD7927
12
200
3.6 max
AD7918
10
1,000
6 max
AD7908
8
1,000
6 max
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Generic
Resolution
(Bits)
Throughput
(kSPS)
Power
(mW)
AD7490
12
1,000
5.4 max
Motor Control—AD7266/AD7265—2 MSPS and 1 MSPS 12-Bit SARs
The AD7266 is a simultaneous sampling, dual-channel, 12-bit SAR ADC, enabling extremely fast loop-settling time with throughput
rates up to 2 MSPS. The IC’s analog input architecture and signal ranges are designed to interface with popular, off-the-shelf optical
encoders which provide a low cost, high accuracy solution. Optical encoders are in servo control applications, such as robots and
turning machines that require shaft feedback to the controller for precise positioning of mechanical movements. The chip consumes
27 mW of power (less than one half that of any other 2 MSPS simultaneous sampling ADC on the market). A 1 MSPS version—the
AD7265—is also available. The AD7265 and AD7266 are available in 32-lead LFCSP or TQFP packages.
Pricing in 1,000-piece quantities is $5.75 for the AD7265 and $7.55 for the AD7266.
For more information on the AD7400 and AD2S1200 and other motor control parts, check out www.analog.com/motorcontrol.
6
Bipolar ADC Portfolio Product Selector
Generic
AD7898
Generic
Resolution
(Bits)
Throughput Power
(kSPS)
(mW)
AD7893
12
117
25 max
Generic Resolution
(Bits)
Throughput Power
(kSPS)
(mW)
AD7895
12
200
16 max
AD7892 12
600
AD7894
14
200
20 max
Resolution
(Bits)
Throughput Power
(kSPS)
(mW)
12
220
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22.5 max
50 max
Generic
Resolution Throughput Power
(Bits)
(kSPS)
(mW)
Channel
Count
AD7656
16
250
160
6
AD7657
14
250
160
6
AD7658
12
250
160
6
AD7891
12
500
82 max
8
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Generic
Resolution Throughput Power
(Bits)
(kSPS)
(mW)
Channel
Count
AD7321
13
500
12
2
AD7322
13
1,000
12
2
AD7323
13
500
12
4
AD7324
13
1,000
12
4
AD7327
13
500
12
8
AD7328
13
1,000
12
8
AD7329
13
400
12
8
AD7890
12
100
30 max 8
Generic
Resolution
(Bits)
Throughput Power
(kSPS)
(mW)
AD7899
14
400
80 max
AD7328: True Bipolar Input iCMOS Multichannel ADC Has High Impedance Inputs and Software-Programmable AIN
Ranges from 2.5 V to 10 V
The AD7328 has high voltage devices on the front end, which can accommodate input voltage ranges from ±2.5 V
to ±10 V, while providing high dc and ac input impedances. The analog input channels can be configured as singleended, fully differential, or pseudo differential. Dedicated control register bits are used to configure the analog
inputs. The ADCs contain a channel sequencer, allowing automatic conversions on a group of preprogrammed
analog input channels.
AD7656—High Accuracy, Simultaneous
Sampling iCMOS ADC
The AD7656 is highly integrated with six 16-bit
successive approximation ADCs featuring fast
throughput rates up to 250 kSPS per channel, and
a 2.5 V internal reference housed in one package.
The AD7656 contains low noise, wide bandwidth
track-and-hold amplifiers that can handle input
frequencies up to 8 MHz. Independent simultaneous
sampling can be performed on the three ADC pairs.
The AD7656 has both a high speed parallel and
serial interface.
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7
AD799x I2C Devices—ADCs for System Monitoring and Control
Features
• 12-bit, 10-bit ADCs with 188 kSPS
in high speed I2C® interface
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• 2, 4, and 8 single-ended analog
input channels
• Specified for VDD of 2.7 V to 5.5 V
• Low power consumption: <1 mW
• On-chip channel sequencer
• Automatic cycle mode
• I2C-compatible serial interface
Applications
• Standard, fast, and high speed modes
• Channel monitoring
• Out-of-range indicator/alert function
• Battery and temperature measurements
• Pin-selectable addressing via AS
• Medical instruments
• Shutdown mode: 1 A max
• Voltage monitoring
• MSOP and TSSOP packages
The AD799x is a family of multichannel, 12-bit and 10-bit successive approximation ADCs with a fully I2C- and SMBus-compatible
interface. These parts operate from a single 2.7 V to 5.5 V power supply and feature a conversion time of 2 s. The family includes
versions with two, four, and eight single-ended analog input channels in 10-lead MSOP, 16-lead TSSOP, and 20-lead TSSOP packages.
The I2C-compatible interface supports standard, fast, and high speed modes.
AD793x—World’s Fastest Multiplexed SAR Converters
The AD793x is a family of multichannel, 12-bit and 10-bit
ADCs with throughput rates to 1.5 MSPS. Data transfers
are made over a parallel bus, and the parts operate from
a single 2.7 V to 5.25 V power supply.
Features
• 10-bit and 12-bit resolutions
• Fast throughput rate: up to 1.5 MSPS
• Specified for VDD of 2.7 V to 5.25 V
• Low power: 8 mW max at 1.5 MSPS
with 3 V supplies
• 4 and 8 analog input channels with
a sequencer
• Software-configurable analog inputs
• Accurate on-chip 2.5 V reference
Generic
Resolution
(Bits)
• Wide input bandwidth: >20 MHz
Throughput
(kSPS)
Channels
AD7938/AD7938-6 12
1,500/600
8
AD7934/AD7934-6 12
1,500/600
4
• High speed parallel interface—
word/byte modes
AD7939
10
1,500
8
• Full shutdown mode: 1 A max
AD7933
10
1,500
4
• TSSOP, TQFP, and LFCSP packages
• No pipeline delays
8
Advance Your Designs with Our Broad Range of PulSAR® ADCs
Some designs demand the highest performance ADCs available. For those there’s only one place to go—Analog Devices. Our broad portfolio
of 16-bit and 18-bit SAR ADCs delivers the highest performance with less power, smaller sizes, and lower overall systems costs.
AD7621—Unequalled SAR ADC Precision and Speed
With the AD7621, ADI sets a speed record of
3 MSPS, without sacrificing precision: the device
offers 1 LSB of INL and DNL, plus 90 dB SNR. To
achieve these speed and accuracy levels, ADI’s
design engineers migrated from a 0.6 m process
to a 0.25 m process, setting the stage for the
fast transistors that make up the quick comparator
and fast digital logic. The sampling circuitry at the
front of the ADC had to provide enough bandwidth
and be ultralow in noise to support the 3 MSPS
sampling rate and the 90 dB SNR spec, while the
comparator had to settle very quickly (at least 16
times faster than the ADC itself) to make the right
bit decisions that ensure the high accuracy. These advances result in numerous benefits—designers can
use fewer ADCs per channel, and therefore lower their overall cost per channel, and the higher accuracy
decreases the need for an expensive PGA in front of the ADC, which also results in a lower cost per channel.
Features
• 3 MSPS
• 90 dB SNR
• 16 bits, no missing codes
• Single-supply 2.5 V
• 1 LSB INL/DNL
• No pipeline delay
• Low power: 100 mW typ
@ 3 MSPS
• 48-lead LFCSP packages
PulSAR Selection Table
1
2
Part
Number
Resolution
(Bits)
Sampling Rate
(kHz)
Interface
Channels
AD7641
AD7643
AD7674
AD7679
AD7678
AD7621
AD7623
AD7653
AD7667
AD7671
AD7677
AD76542
AD76552
AD7650
AD7664
AD7665
AD7686
AD7688
AD7652
AD7666
AD7676
AD7946
AD7656
AD7663
AD7685
AD7687
AD7942
AD974
AD976A
AD977A
AD7651
AD7660
AD7661
AD7675
AD7680
AD7683
AD7684
18
18
18
18
18
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
14
16
16
16
16
14
16
16
16
16
16
16
16
16
16
16
2,000
1,250
800
570
100
3,000
1,333
1,000
1,000
1,000
1,000
1,000
1,000
570
570
570
500
500
500
500
500
500
250
250
250
250
250
200
200
200
100
100
100
100
100
100
100
18P, S
18P, S
18P, S
18P, S
18P, S
16P, S
16P, S
16P, S
16P, S
16P, S
16P, S
16P, S
16P, S
16P, S
16P, S
16P, S
S
S
16P, S
16P, S
16P, S
S
16P, S
16P, S
S
S
S
S
16P
S
16P, S
16P, S
16P, S
16P, S
S
S
S
1
1
1
1
1
1
1
1
1
1
1
4
4
1
1
1
1
1
1
1
1
1
6
1
1
1
1
4
1
1
1
1
1
1
1
1
1
Voltage Supply
2.5 V (3 V, 5 V logic)
2.5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
2.5 V (3 V, 5 V logic)
2.5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
2.7 V to 5 V
2.7 V to 5 V
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
2.7 V to 5 V
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
2.7 V to 5 V
2.7 V to 5 V
2.7 V to 5 V
5V
5V
5V
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
5 V (3 V, 5 V logic)
3 V to 5 V
2.7 V to 5 V
2.7 V to 5 V
Power (mW)
Max
Voltage
Reference
100 typ
100 typ
126
103
26
100 typ
100 typ
145
145
125
130
135
135
115
115
107
20 typ
44 typ
90
90
74
25
60 typ
41
15
20 typ
12.5
120
100
100
45
25
45
25
10
6
6
Yes
Yes
Buffer only
Buffer only
Buffer only
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
Yes
Yes
No
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
Input range: differential implies that +IN and –IN can vary from –0.1 to VDD (or within 2 V of VDD) when referred to AGND. Pseudo differential implies that the –IN input can only vary ±100 mV typically.
2  2 channel simultaneous sampling.
Input Range1
(V)
VREF differential
VREF differential
5 differential
5 differential
5 differential
VREF differential
VREF differential
0 to 2.5
0 to 2.5
2.5, 5, 10, +2.5, +5, +10
2.5 @ 2.5
0 to 5
0 to 5
0 to 2.5
0 to 2.5
2.5, 5, 10, +2.5, +5, +10
0 to VREF (pseudo differential)
VREF differential
0 to 2.5
0 to 2.5
2.5 @ 2.5
0 to VREF (pseudo differential)
5, 10
2.5, 5, 10, +2.5, +5, +10
0 to VREF (pseudo differential)
VREF differential
0 to VREF (pseudo differential)
+4, +5, 10
10
3.3, 5, 10, +4, +5, +10
0 to 2.5
0 to 2.5
0 to 2.5
2.5 @ 2.5
0 to VDD
0 to VREF
VREF
9
AD7641: World’s Fastest SAR ADC at 18-Bits and 2 MSPS
The AD7641 has raised the top speed for 18-bit SAR ADCs from
800 kSPS to 2 MSPS. Typical INL is ± 2.5 LSB with 18 bits no missing
codes guaranteed over temperature. The AD7641 also offers 90 dB of
SNR and –100 dB of THD, both specified at 100 kHz. This combination
of outstanding ac and dc performance will attract customers needing
to convert fast moving signals to the highest level of accuracy. Medical
imaging, high speed data acquisition, and automatic test equipment are
just a few of the applications that take advantage of the AD7641’s rare
combination of accuracy and speed. Its 4 increase in resolution over
16-bit ADCs will allow most customers to omit expensive programmable
gain amplifiers from their systems. Other features include: serial and
parallel interfaces, 2.5 V internal reference, fully differential inputs, and
three-way, power-down capability. The AD7641 is available in both 48-lead
LQFP and 48-lead chip scale packages.
No Missing
Codes
DNL
(LSB)
INL
(LSB)
SNR
THD
18
18
18
18
18
16
16
15
15
16
16
16
15
15
16
16
16
16
15
15
16
14
15
16
16
16
14
15, 16
15, 16
15, 16
15
16
15
16
15 @ 5 V, 16 @ 3 V
15, 16
15, 16
N/A
N/A
N/A
N/A
N/A
1
1
N/A
N/A
N/A
1
N/A
N/A
N/A
–1.0/+1.5
N/A
N/A
N/A
N/A
N/A
N/A
–0.7/+0.7
N/A
N/A
N/A
N/A
–0.7/+0.7
–2/+3, –1/+1.5
–2/+3, –1/+1.5, 2 typ
–2/+3, –1/+1.5, 2 typ
N/A
–1.0/+1.75
N/A
N/A
–0.9, +2.5 @ 3 V, 2.5 @ 5 V
N/A
N/A
3
3
2.5
2.5
2.5
2
2
6
2.5
2.5
1
3.5
6
6
2.5
2.5
2.5
1.5
6
2.5
1
1
4
3
2.5
1.5
1
3, 2
3, 2, 3 typ
3, 2, 3 typ
6
3
2.5
1.5
4
6, 3
6, 3
93 typ
93 typ
100
100
100
88
88
86 typ
90 typ
89
92
88
86 typ
86 typ
90 typ
89
92 typ
92
86 typ
90 typ
92
83
83
89
92 typ
92
83
83, 85
83, 85
83, 85
86 typ
87
90 typ
92
85 @ 3 V, 84 @ 5 V
90, 91
90, 91
–100 typ
–100 typ
–110 typ
–110 typ
–110 typ
–100 typ
–100 typ
–98 typ
–100 typ
–96
–103.5
–100 typ
–96 typ
–98 typ
–100 typ
–100 typ
100 typ
100 typ
–98 typ
–100 typ
–103.5
–100 typ
–97 typ
–100 typ
100 typ
100 typ
–100 typ
–90/–96
–90/–96
–90/–96
–98 typ
–96
–100 typ
–103.5
–95 typ
–100/–106
–100/–106
Package
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
10-lead MSOP
10-lead MSOP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
10-lead MSOP
64-LQFP
48-lead LQFP, LFCSP
10-lead MSOP
10-lead MSOP
10-lead MSOP
28-lead SSOP
28-lead SOIC, PDIP
20-lead SSOP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
48-lead LQFP, LFCSP
6-lead SOT-23
8-lead MSOP
8-lead MSOP
Price @ 1k
($U.S.)
32.95
29.95
27.95
25.60
19.20
29.95
24.95
11.50
23.50
21.95
32.95
15.42
9.45
7.50
18.65
19.00
12.00
14.95
9.45
18.00
24.95
7.37
17.00
12.00
8.00
8.95
4.75
26.40
20.73
20.73
7.45
7.91
8.95
12.00
6.00
6.50
6.50
Part Number
Resolution (Bits)
Data Bus Interface
Single-Channel True Differential and Pseudo Differential ADCs
AD7450A
12
Serial
AD7452
12
Serial
AD7440
10
Serial
AD7451
12
Serial
AD7453
12
Serial
AD7457
12
Serial
AD7441
10
Serial
Single-Ended Low Power ADC
AD7466
12
Serial
AD7467
10
Serial
AD7468
8
Serial
AD7274
12
Serial
AD7276
12
Serial
AD7476A
12
Serial
AD7920
12
Serial
AD7475
12
Serial
AD7495
12
Serial
AD7277
10
Serial
AD7273
10
Serial
AD7477A
10
Serial
AD7910
10
Serial
AD7278
8
Serial
AD7478A
8
Serial
AD7472
12
Parallel
AD7492
12
Parallel
AD7470
10
Parallel
Multichannel Parallel ADCs
AD7938
12
Parallel
AD7938-6
12
Parallel
AD7939
10
Parallel
AD7934
12
Parallel
AD7934-6
12
Parallel
AD7933
10
Parallel
Multichannel I2C ADCs
AD7992
12
I2C
AD7993
10
I2C
AD7994
12
I2C
AD7997
10
I2C
AD7998
12
I2C
Multichannel SPI QSPI MICROWIRE DSP ADCs
AD7922
12
Serial
AD7921
12
Serial
AD7912
10
Serial
AD7911
10
Serial
AD7924
12
Serial
AD7923
12
Serial
AD7914
10
Serial
AD7904
8
Serial
AD7928
12
Serial
AD7927
12
Serial
AD7918
10
Serial
AD7908
8
Serial
AD7490
12
Serial
Bipolar, Serial/Parallel, and Parallel ADCs
AD7893
12
Serial
AD7895
12
Serial
AD7894
14
Serial
AD7898
12
Serial
AD7321
13
Serial
AD7322
13
Serial
AD7323
13
Serial
AD7324
13
Serial
AD7327
13
Serial
AD7328
13
Serial
AD7329
13
Serial
AD7890
12
Serial
AD7899
14
Parallel
AD7892
12
Serial/Parallel
AD7891
12
Serial/Parallel
AD7656
16
Serial/Parallel
AD7657
14
Serial/Parallel
AD7658
12
Serial/Parallel
Simultaneous Sampling ADCs
AD7862
12
Parallel
AD7863
14
Parallel
AD7864
12
Parallel
AD7865
14
Parallel
AD7866
12
Serial
AD7265
12
Serial
AD7266
12
Serial
Sample Rate (kSPS)
Number of Channels
Supply Range
Power (mW)
Power-Down Mode
1,000
555
1,000
1,000
555
100
1,000
1
1
1
1
1
1
1
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
4 max
3.3 max
4 max
4 max
3.3 max
1 max
4 max
Yes
Yes
Yes
Yes
Yes
Yes
Yes
200
200
100
3,000
3,000
1,000
250
1,000
1,000
3,000
3,000
1,000
250
3,000
1,000
1,500
1,250
1,750
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1.6 V to 3.6 V
1.6 V to 3.6 V
1.6 V to 3.6 V
2.35 V to 3.6 V
2.35 V to 3.6 V
2.35 V to 5.25 V
2.35 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.35 V to 3.6 V
2.35 V to 3.6 V
2.35 V to 5.25 V
2.35 V to 5.25 V
2.35 V to 3.6 V
2.35 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
0.3 max
0.21 max
0.2 max
12.5
12.5
5.1 max
4.2 max
4.5 max
6 max
10.5
10.5
5.1 max
4.2 max
10.5
5.1 max
4.5 max
9 max
4.5 max
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
1,500
625
1,500
1,500
625
1,500
8
8
8
4
4
4
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
4.5
3
4.5
4.5
3
4.5
Yes
Yes
Yes
Yes
Yes
Yes
188
188
188
188
188
2
4
4
8
8
2.7 V to 5.5 V
2.7 V to 5.5 V
2.7 V to 5.5 V
2.7 V to 5.5 V
2.7 V to 5.5 V
0.495 max
0.495 max
0.495 max
0.495 max
0.495 max
Yes
Yes
Yes
Yes
Yes
1,000
250
1,000
250
1,000
200
1,000
1,000
1,000
200
1,000
1,000
1,000
2
2
2
2
4
4
4
4
8
8
8
8
16
2.35 V to 5.25 V
2.35 V to 5.25 V
2.35 V to 5.25 V
2.35 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
6 max
6 max
6 max
6 max
6 max
3.6 max
6 max
6 max
6 max
3.6 max
6 max
6 max
5.4 max
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
117
200
200
220
500
1,000
500
1,000
500
1,000
250
100
400
600
500
250
250
250
1
1
1
1
2
2
4
4
8
8
8
8
1
1
8
6
6
6
Single 5 V supply
Single 5 V supply
Single 5 V supply
Single 5 V supply
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
2.7 V to 5.25 V
Single 5 V supply
Single 5 V supply
Single 5 V supply
Single 5 V supply
4.75 V to 5.25 V
4.75 V to 5.25 V
4.75 V to 5.25 V
25 max
16 max
20 max
22.5 max
12
12
12
12
12
12
12
30 max
80 max
60 max
82 max
160
160
160
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Yes
250
175
520
350
1,000/666
1,000
2,000
2
2
4
4
2
Dual 3-channel
Dual 3-channel
Single 5 V supply
Single 5 V supply
Single 5 V supply
Single 5 V supply
2.7 V to 5.5 V
2.7 V to 5.25 V
2.7 V to 5.25 V
60 max
45 max
90 max
100 max
11.4 max
7
27
Yes
Yes
No
No
Yes
Yes
Yes
Analog Input Range
Reference
Price @ 1k ($U.S.) Pin Count and Package
Features
2  VREF
2  VREF
2  VREF
VREF
VREF
VREF
VREF
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
4.30
2.95
2.50
4.25
2.95
2.05
2.50
8-lead SOT-23 and MSOP
8-lead SOT-23
8-lead SOT-23 and MSOP
8-lead SOT-23 and MSOP
8-lead SOT-23
8-lead SOT-23
8-lead SOT-23 and MSOP
Differential input, 1 MSPS, 12-bit ADC
Differential input, 555 kSPS, 12-bit ADC
Differential input, 1 MSPS, 10-bit ADC
Pseudo differential, 1 MSPS, 12-bit ADC
Pseudo differential, 555 kSPS, 12-bit ADC
Pseudo differential, 100 kSPS, 12-bit ADC
Pseudo differential, 1 MSPS, 10-bit ADC
0 V to VDD
0 V to VDD
0 V to VDD
0 V to VREF
0 V to VDD
0 V to VDD
0 V to VDD
0 V to REFIN
0 V to 2.5 V
0 V to VDD
0 V to VREF
0 V to VDD
0 V to VDD
0 V to VDD
0 V to VDD
0 V to REFIN
0 V to 2.5 V
0 V to REFIN
VDD
VDD
VDD
1.2 V to VDD ext
VDD
VDD
VDD
2.5 V ext
2.5 V int
VDD
1.2 V to VDD ext
VDD
VDD
VDD
VDD
2.5 V ext
2.5 V int
2.5 V ext
2.35
1.90
1.15
6.50
6.25
4.00
2.05
4.25
5.19
3.60
3.75
2.50
1.75
1.85
0.95
6.25
6.89
3.00
6-lead SOT-23 and 8-lead MSOP
6-lead SOT-23 and 8-lead MSOP
6-lead SOT-23 and 8-lead MSOP
8-lead TSOT and 8-lead MSOP
6-lead TSOT and 8-lead MSOP
6-lead SC70 and 8-lead MSOP
6-lead SC70 and 8-lead MSOP
8-lead MSOP and SOIC
8-lead MSOP and SOIC
6-lead TSOT and 8-lead MSOP
8-lead TSOT and 8-lead MSOP
6-lead SC70 and 8-lead MSOP
6-lead SC70 and 8-lead MSOP
6-lead TSOT and 8-lead MSOP
6-lead SC70 and 8-lead MSOP
24-lead SOIC and TSSOP
24-lead TSSOP and 24-lead SOIC
24-lead SOIC and TSSOP
1.6 V, micropower, 12-bit ADC
1.6 V, micropower, 10-bit ADC
1.6 V, micropower, 8-bit ADC
12-bit, 3 MSPS SAR ADC with external VREF
12-bit, 3 MSPS SAR ADC
2.35 V to 5.25 V, 1 MSPS, 12-bit ADC
Low power, 250 kSPS, 12-bit ADC
Low power, 1 MSPS, 12-bit ADC
Low power, 1 MSPS, 12-bit ADC with internal VREF
10-bit, 3 MSPS SAR ADC
10-bit, 3 MSPS SAR ADC with external VREF
2.35 V to 5.25 V, 1 MSPS, 10-bit ADC
Low power, 250 kSPS, 10-bit ADC
8-bit, 3 MSPS SAR ADC
2.35 V to 5.25 V, 1 MSPS, 8-bit ADC
1.5 MSPS, 4.5 mW, 12-bit parallel ADC
1.25 MSPS, 16 mW, IntREF and CLK, 12-bit parallel ADC
1.75 MSPS, 4.5 mW, 10-bit parallel ADC
0 to VREF, 0 V to 2  VREF
0 to VREF, 0 V to 2  VREF
0 to VREF, 0 V to 2  VREF
0 to VREF, 0 V to 2  VREF
0 to VREF, 0 V to 2  VREF
0 to VREF, 0 V to 2  VREF
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
7.35
4.85
3.75
7.10
4.60
3.50
32-lead TQFP and LFCSP
32-lead TQFP and LFCSP
32-lead TQFP and LFCSP
28-lead TSSOP
28-lead TSSOP
28-lead TSSOP
8-channel, 1.5 MSPS, 12-bit parallel ADC with a sequencer
8-channel, 625 kSPS, 12-bit parallel ADC with a sequencer
8-channel, 1.5 MSPS, 10-bit parallel ADC with a sequencer
4-channel, 1.5 MSPS, 12-bit parallel ADC with a sequencer
4-channel, 625 kSPS, 12-bit parallel ADC with a sequencer
4-channel, 1.5 MSPS, 10-bit parallel ADC with a sequencer
0 V to REFIN
0 V to REFIN
0 V to REFIN
0 V to REFIN
0 V to REFIN
0 V to VDD ext
0 V to VDD ext
0 V to VDD ext
0 V to VDD ext
0 V to VDD ext
3.00
1.99
3.50
2.25
3.75
10-lead MSOP
16-lead TSSOP
16-lead TSSOP
20-lead TSSOP
20-lead TSSOP
2-channel, 12-bit ADC with I2C-compatible interface
4-channel, 10-bit ADC with I2C-compatible interface
4-channel, 12-bit ADC with I2C-compatible interface
8-channel, 10-bit ADC with I2C-compatible interface
8-channel, 12-bit ADC with I2C-compatible interface
0 V to VDD
0 V to VDD
0 V to VDD
0 V to VDD
0 V to REFIN
0 V to REFIN
0 V to REFIN
0 V to REFIN
0 V to REFIN
0 V to REFIN
0 V to REFIN
0 V to REFIN
0 V to REF
VDD
VDD
VDD
VDD
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
4.25
2.30
2.75
2.00
4.50
2.55
3.00
1.55
4.75
2.80
3.25
1.85
5.95
8-lead TSOT and 8-lead MSOP
8-lead TSOT and 8-lead MSOP
8-lead TSOT and 8-lead MSOP
8-lead TSOT and 8-lead MSOP
16-lead TSSOP
16-lead TSSOP
16-lead TSSOP
16-lead TSSOP
20-lead TSSOP
20-lead TSSOP
20-lead TSSOP
20-lead TSSOP
28-lead TSSOP and 32-lead LFCSP
12-bit, 2-channel, 1 MSPS ADC
12-bit, 2-channel, 250 kSPS ADC
10-bit, 2-channel, 1 MSPS ADC
10-bit, 2-channel, 250 kSPS ADC
4-channel, 1 MSPS, 12-bit ADC with sequencer
4-channel, 200 kSPS, 12-bit ADC with sequencer
4-channel, 1 MSPS, 10-bit ADC with sequencer
4-channel, 1 MSPS, 8-bit ADC with sequencer
8-channel, 1 MSPS, 12-bit ADC with sequencer
8-channel, 200 kSPS, 12-bit ADC with sequencer
8-channel, 1 MSPS, 10-bit ADC with sequencer
8-channel, 1 MSPS, 8-bit ADC with sequencer
16-channel, 1 MSPS, 12-bit ADC with sequencer
10 V, 2.5 V, 0 V to +5 V, 0 V to +2.5 V
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
9.00
4.95
9.90
4.97
3.00
4.75
3.62
5.75
3.94
6.25
3.90
10.20
9.90
12.75
14.75
17.00
12.95
10.60
8-lead DIP and SOIC
8-lead DIP and SOIC
8-lead SOIC
8-lead SOIC
14-lead TSSOP
14-lead TSSOP
16-lead TSSOP
16-lead TSSOP
20-lead TSSOP
20-lead TSSOP
24-lead TSSOP
24-lead DIP and SOIC
28-lead SOIC and SSOP
24-lead DIP and SOIC
44-lead MQFP and PLCC
64-lead LQFP
64-lead LQFP
64-lead LQFP
LC2MOS 12-bit, serial, 117 kSPS, 6 ms ADC
5 V, 12-bit, serial, 200 kSPS, 3.8 ms ADC
5 V, 14-bit, serial, 200 kSPS, 5 ms ADC
5 V, 12-bit, serial, 220 kSPS ADC
iCMOS™ 12-bit plus sign, 250 kSPS, bipolar 8-channel ADC
iCMOS 12-bit plus sign, 250 kSPS, bipolar 8-channel ADC
iCMOS 12-bit plus sign, 250 kSPS, bipolar 4-channel ADC
iCMOS 12-bit plus sign, 250 kSPS, bipolar 4-channel ADC
iCMOS 12-bit plus sign, 250 kSPS, bipolar 2-channel ADC
iCMOS 12-bit plus sign, 250 kSPS, bipolar 2-channel ADC
iCMOS 12-bit plus sign, 250 kSPS, bipolar ADC with mux out
LC2MOS 8-channel, 12-bit, serial, data acquisition system
5 V single-supply, 14-bit, 400 kSPS ADC
LC2MOS single-supply, 12-bit, 600 kSPS ADC
LC2MOS 8-channel, 12-bit, high speed, data acquisition system
iCMOS 250 kSPS, 6-channel, simultaneous sampling, bipolar 16-bit ADC
iCMOS 250 kSPS, 6-channel, simultaneous sampling, bipolar 14-bit ADC
iCMOS 250 kSPS, 6-channel, simultaneous sampling, bipolar 12-bit ADC
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
2.5 V ext/int
11.00
14.50
13.65
14.85
6.80
5.75
7.55
28-lead SSOP, SOIC, and DIP
28-lead SOIC and SSOP
44-lead MQFP
44-lead PQFP
16-lead TSSOP
32-lead TQFP and LFCSP
32-lead TQFP and LFCSP
Simultaneous sampling, dual, 250 kSPS, 12-bit ADC
Simultaneous sampling, dual, 175 kSPS, 14-bit ADC
4-channel, simultaneous sampling, high speed, 12-bit ADC
4-channel, simultaneous sampling, fast, 14-bit ADC
Dual, 1 MSPS, 12-bit, 2-channel SAR ADC, serial interface
Differential input, dual 1 MSPS, 12-bit, 3-channel SAR ADC
Differential input, dual 2 MSPS, 12-bit, 3-channel SAR ADC
10 V, 2.5 V, 0 V to +2.5 V
10 V, 2.5 V, 0 V to +2.5 V
10 V, 2.5 V
10 V,  5 V, 2.5 V, 0 V to 10 V
10 V,  5 V, 2.5 V, 0 V to 10 V
10 V,  5 V, 2.5 V, 0 V to 10 V
10 V,  5 V, 2.5 V, 0 V to 10 V
10 V,  5 V, 2.5 V, 0 V to 10 V
10 V,  5 V, 2.5 V, 0 V to 10 V
10 V,  5 V, 2.5 V, 0 V to 10 V
10 V, 0 V to +4 V, 0 V to +2.5 V
10 V, 5 V, 2.5 V, 0 V to +2.5 V, 0 V to +5 V
10 V, 5 V, 0 V to +2.5 V, 2.5 V
10 V, 5 V, 2.5 V, 0 V to +2.5 V, 0 V to +5 V
4  VREF, 2  VREF
4  VREF, 2  VREF
4  VREF, 2  VREF
10 V, 2.5 V, +2.5 V
10 V, 2.5 V, +2.5 V
5 V, 10 V, 2.5 V, +2.5 V, +5 V
5 V, 10 V, 0 V to +2.5 V, 0 V to +5 V, 2.5 V
0 to VREF, 0 V to 2  VREF
0 to VREF, 0 V to 2  VREF
0 to VREF, 0 V to 2  VREF
Analog Devices, Inc.
Worldwide Headquarters
Analog Devices, Inc.
One Technology Way
P.O. Box 9106
Norwood, MA
02062-9106 U.S.A.
Tel: 781.329.4700
(800.262.5643,
U.S.A. only)
Fax: 781.461.3113
One Small Package with Many Resolution Options
Analog Devices’ ADC portfolio includes pin-compatible 8-bit to 16-bit
ADCs, in a tiny SOT-23 package.
The most flexible and fastest way to product upgrades is to simply replace
the A/D converter with a higher resolution pin-for-pin replacement. This
flexibility also allows the manufacturer to traverse the price/performance
curve with just one board design.
ADI has several upgrade paths available to designers to accomplish
jumps in performance in the shortest time possible. Our family of AD747x
and AD746x 8-bit to 12-bit ADCs are not only pin-compatible with each
other but also with the smallest 14-bit and 16-bit ADCs available on the
market—the AD7940 and AD7680. These high performance ADCs combine
the smallest package size—SOT-23-6—with the lowest power dissipation.
The AD746x family dissipates just 0.15 mW of power at 100 kSPS while
operating from a 1.8 V supply. The AD747x, AD7940, and AD7680 ADCs
can operate from a 2.5 V to 5.5 V supply.
Analog Devices, Inc.
Europe Headquarters
Analog Devices SA
17-19 rue Georges Besse
Antony, 92160
France
Tel: 33.1.46.74.45.00
Fax: 33.1.46.74.45.01
This group of ADCs offers small packages, low power, and affordable pricing with the
added benefit of pin-for-pin compatibility to make designing with ADI your first choice.
Generic
Resolution (Bits)
Data Rate (kSPS)
Power Supply
Package
AD7278
8
3,000
2.35 V to 3.6 V
6-lead SOT-23
AD7478
8
1,000
2.35 V to 5.25 V
6-lead SOT-23
AD7468
8
200
1.8 V to 3.6 V
6-lead SOT-23
AD7277
10
3,000
2.35 V to 3.6 V
6-lead SOT-23
AD7477
10
1,000
2.35 V to 5.25 V
6-lead SOT-23
AD7467
10
200
1.8 V to 3.6 V
6-lead SOT-23
AD7276
12
3,000
2.35 V to 3.6 V
6-lead SOT-23
AD7476
12
1,000
2.35 V to 5.25 V
6-lead SOT-23
AD7466
12
200
1.8 V to 3.6 V
6-lead SOT-23
AD7940
14
100
2.35 V to 5.25 V
6-lead SOT-23
AD7680
16
100
2.35 V to 5.25 V
6-lead SOT-23
Analog Devices, Inc.
Japan Headquarters
Analog Devices, KK
New Pier Takeshiba
South Tower Building
1-16-1 Kaigan, Minato-ku,
Tokyo, 105-6891
Japan
Tel: 813.5402.8200
Fax: 813.5402.1064
Analog Devices, Inc.
Southeast Asia
Headquarters
Analog Devices
22/F One Corporate Avenue
222 Hu Bin Road
Shanghai, 200021
China
Tel: 86.21.5150.3000
Fax: 86.21.5150.3222
Evaluation Boards
Evaluation boards are available on most ADCs. These are complete self-contained
evaluation tools for these precision converters. These boards essentially allow
development engineers to evaluate the features, functions, and performance of the
devices in determining suitability for the end-user application. Evaluation boards
interface to the PC via the parallel printer port and come with a suite of software
designed to allow control of all programmable functions.
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© 2005 Analog Devices, Inc. All rights reserved.
Trademarks and registered trademarks are the property
of their respective owners.
Printed in the U.S.A.
BR04334-5-7/05(B)
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