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Analog Devices Semiconductor Electronic Components Datasheet

AD7470 Datasheet

4 mW 10-Bit/12-Bit Parallel ADCs

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a
1.75 MSPS, 4 mW
10-Bit/12-Bit Parallel ADCs
AD7470/AD7472
FEATURES
Specified for VDD of 2.7 V to 5.25 V
1.75 MSPS for AD7470 (10-Bit)
1.5 MSPS for AD7472 (12-Bit)
Low Power
AD7470: 3.34 mW Typ at 1.5 MSPS with 3 V Supplies
7.97 mW Typ at 1.75 MSPS with 5 V Supplies
AD7472: 3.54 mW Typ at 1.2 MSPS with 3 V Supplies
8.7 mW Typ at 1.5 MSPS with 5 V Supplies
Wide Input Bandwidth
70 dB Typ SNR at 500 kHz Input Frequency
Flexible Power/Throughput Rate Management
No Pipeline Delays
High Speed Parallel Interface
Sleep Mode: 50 nA Typ
24-Lead SOIC and TSSOP Packages
FUNCTIONAL BLOCK DIAGRAM
AVDD DVDD
REF IN
VDRIVE
10-/12-BIT
VIN
T/H
SUCCESSIVE
APPROXIMATION
OUTPUT
DRIVERS
ADC
DB9 (DB11)
DB0
CONVST
CONTROL
LOGIC
AD7470/AD7472
CLK IN
CS
RD
BUSY
GENERAL DESCRIPTION
The AD7470/AD7472 are 10-bit/12-bit high speed, low power,
successive-approximation ADCs. The parts operate from a
single 2.7 V to 5.25 V power supply and feature throughput rates
up to 1.5 MSPS for the 12-bit AD7472 and up to 1.75 MSPS for
the 10-bit AD7470. The parts contain a low noise, wide band-
width track/hold amplifier that can handle input frequencies in
excess of 1 MHz.
The conversion process and data acquisition are controlled
using standard control inputs allowing easy interfacing to
microprocessors or DSPs. The input signal is sampled on the
falling edge of CONVST and conversion is also initiated at
this point. The BUSY goes high at the start of conversion and
goes low 531.66 ns after falling edge of CONVST (AD7472 with
a clock frequency of 26 MHz) to indicate that the conversion is
complete. There are no pipelined delays associated with the part.
The conversion result is accessed via standard CS and RD sig-
nals over a high speed parallel interface.
The AD7470/AD7472 uses advanced design techniques to
achieve very low power dissipation at high throughput rates. With
3 V supplies and 1.5 MSPS throughput rate, the AD7470 typi-
cally consumes, on average, just 1.1 mA. With 5 V supplies and
1.75 MSPS, the average current consumption is typically
1.6 mA. The part also offers flexible power/throughput rate
management. Operating the AD7470 with 3 V supplies and
500 kSPS throughput reduces the current consumption to 713 µA.
At 5 V supplies and 500 kSPS, the part consumes 944 µA.
AGND DGND
AD7470 IS A 10-BIT PART WITH DB0 TO DB9 AS OUTPUTS.
AD7472 IS A 12-BIT PART WITH DB0 TO DB11 AS OUTPUTS.
It is also possible to operate the parts in an auto sleep mode,
where the part wakes up to do a conversion and automatically
enters sleep mode at the end of conversion. Using this method
allows very low power dissipation numbers at lower throughput
rates. In this mode, the AD7472 can be operated with 3 V sup-
plies at 100 kSPS, and consume an average current of just 124 µA.
At 5 V supplies and 100 kSPS, the average current consumption
is 171 µA.
The analog input range for the part is 0 to REF IN. The +2.5 V
reference is applied externally to the REF IN pin. The conver-
sion rate is determined by the externally-applied clock.
PRODUCT HIGHLIGHTS
1. High Throughput with Low Power Consumption. The
AD7470 offers 1.75 MSPS throughput and the AD7472
offers 1.5 MSPS throughput rates with 4 mW power
consumption.
2. Flexible Power/Throughput Rate Management. The conver-
sion rate is determined by an externally-applied clock allow-
ing the power to be reduced as the conversion rate is reduced.
The part also features an auto sleep mode to maximize power
efficiency at lower throughput rates.
3. No Pipeline Delay. The part features a standard successive-
approximation ADC with accurate control of the sampling
instant via a CONVST input and once off conversion
control.
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000


Analog Devices Semiconductor Electronic Components Datasheet

AD7470 Datasheet

4 mW 10-Bit/12-Bit Parallel ADCs

No Preview Available !

AD7470/AD7472
AD7470–SPECIFICATIONS1 (VDD = +2.7 V to +5.25 V2, REF IN = 2.5 V, fCLK IN = 30 MHz @ 5 V and 24 MHz @ 3 V;
TA = TMIN to TMAX3, unless otherwise noted.)
Parameter
A Version1
Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
Signal to Noise + Distortion (SINAD)
Signal-to-Noise Ratio (SNR)
Total Harmonic Distortion (THD)
Peak Harmonic or Spurious Noise (SFDR)
Intermodulation Distortion (IMD)
Second Order Terms
Third Order Terms
Aperture Delay
Aperture Jitter
Full Power Bandwidth
5V
60
60
60
60
–83
–75
–85
–75
–79
–75
–77
–75
5
15
20
3V
60 dB min
60
60 dB min
60
–83 dB typ
–75 dB max
–85 dB typ
–75 dB max
–75 dB typ
–75 dB max
–75 dB typ
–75 dB max
5 ns typ
15 ps typ
20 MHz typ
fS = 1.75 MSPS @ 5 V, fS = 1.5 MSPS @ 3 V
fIN = 500 kHz Sine Wave
fIN = 100 kHz Sine Wave
fIN = 500 kHz Sine Wave
fIN = 100 kHz Sine Wave
fIN = 500 kHz Sine Wave
fIN = 100 kHz Sine Wave
fIN = 500 kHz Sine Wave
fIN = 100 kHz Sine Wave
fIN = 500 kHz Sine Wave
fIN = 100 kHz Sine Wave
fIN = 500 kHz Sine Wave
fIN = 100 kHz Sine Wave
DC ACCURACY
Resolution
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Gain Error
10 10 Bits
± 1 ± 1 LSB max
± 0.9 ± 0.9 LSB max
± 2.5 ± 2.5 LSB max
± 1 ± 1 LSB max
fS = 1.75 MSPS @ 5 V; fS = 1.5 MSPS @ 3 V
Guaranteed No Missed Codes to 10 Bits
ANALOG INPUT
Input Voltage Ranges
DC Leakage Current
Input Capacitance
0 to REF IN
±1
33
0 to REF IN V
± 1 µA max
33 pF typ
REFERENCE INPUT
REF IN Input Voltage Range
DC Leakage Current
Input Capacitance
2.5
±1
10/20
2.5
±1
10/20
V
µA max
pF typ
± 1% for Specified Performance
Track/Hold Mode
LOGIC INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN4
LOGIC OUTPUTS
Output High Voltage, VOH
Output Low Voltage, VOL
Floating-State Leakage Current
Floating-State Output Capacitance
Output Coding
2.4 2.4 V min
0.4 0.4 V max
± 1 ± 1 µA max
10 10 pF max
VDRIVE – 0.2
0.4
VDRIVE – 0.2
0.4
± 10 ± 10
10 10
Straight (Natural) Binary
V min
V max
µA max
pF max
Typically 10 nA, VIN = 0 V or VDD
ISOURCE = 200 µA
ISINK = 200 µA
VDD = 2.7 V to 5.25 V
CONVERSION RATE
Conversion Time
Track/Hold Acquisition Time
Throughput Rate
12 12 CLK IN Cycles (max)
135 135 ns min
1.75 1.5 MSPS max
Conversion Time + Acquisition Time
CLK IN of 30 MHz @ 5 V and 24 MHz @ 3 V
POWER REQUIREMENTS
VDD
IDD5
Normal Mode
Quiescent Current
Normal Mode
Quiescent Current
Sleep Mode
Power Dissipation5
Normal Mode
Sleep Mode
+2.7/+5.25
2.4
900
1.5
800
1
12
4.5
5
3
V min/max
mA max
µA max
mA max
µA max
µA max
mW max
mW max
µW max
µW max
Digital I/Ps = 0 V or DVDD
VDD = 4.75 V to 5.25 V; fS = 1.75 MSPS; Typ 2 mA
VDD = 4.75 V to 5.25 V; fS = 1.75 MSPS
VDD = 2.7 V to 3.3 V; fS = 1.5 MSPS; Typ 1.3 mA
VDD = 2.7 V to 3.3 V; fS = 1.5 MSPS
CLK IN = 0 V or DVDD
Digital I/Ps = 0 V or DVDD
VDD = 5 V
VDD = 3 V
VDD = 5 V; CLK IN = 0 V or DVDD
VDD = 3 V; CLK IN = 0 V or DVDD
NOTES
1Temperature ranges as follows: A Version: -40°C to +85°C.
2The AD7470 functionally works at 2.35 V. Typical specifications @ +25°C for SNR (100 kHz) = 59 dB; THD (100 kHz) = –84 dB; INL ± 0.8 LSB.
3The AD7470 will typically maintain A-grade performance up to +125°C, with a reduced CLK of 20 MHz @ 5 V and 16 MHz @ 3 V. Typical Sleep Mode current @ +125°C is 700 nA.
4Sample tested @ +25°C to ensure compliance.
5See Power vs. Throughput Rate section.
Specifications subject to change without notice.
–2– REV. A


Part Number AD7470
Description 4 mW 10-Bit/12-Bit Parallel ADCs
Maker Analog Devices
Total Page 16 Pages
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