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AD7276 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD7276
Beschreibung 12-/10-/8-Bit ADCs
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 29 Seiten
AD7276 Datasheet, Funktion
FEATURES
Throughput rate: 3 MSPS
Specified for VDD of 2.35 V to 3.6 V
Power consumption
12.6 mW at 3 MSPS with 3 V supplies
Wide input bandwidth
70 dB SNR at 1 MHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High speed serial interface
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
Temperature range: −40°C to +125°C
Power-down mode: 0.1 μA typical
6-lead TSOT package
8-lead MSOP package
AD7476 and AD7476A pin-compatible
GENERAL DESCRIPTION
The AD7276/AD7277/AD7278 are 12-/10-/8-bit, high speed,
low power, successive approximation analog-to-digital converters
(ADCs), respectively. The parts operate from a single 2.35 V
to 3.6 V power supply and feature throughput rates of up to
3 MSPS. The parts contain a low noise, wide bandwidth track-
and-hold amplifier that can handle input frequencies in excess
of 55 MHz.
The conversion process and data acquisition are controlled
using CS and the serial clock, allowing the devices to interface
with microprocessors or DSPs. The input signal is sampled on
the falling edge of CS, and the conversion is also initiated at this
point. There are no pipeline delays associated with the part.
The AD7276/AD7277/AD7278 use advanced design techniques
to achieve very low power dissipation at high throughput rates.
The reference for the part is taken internally from VDD. This
allows the widest dynamic input range to the ADC; therefore,
the analog input range for the part is 0 to VDD. The conversion
rate is determined by the SCLK.
3 MSPS, 12-/10-/8-Bit
ADCs in 6-Lead TSOT
AD7276/AD7277/AD7278
FUNCTIONAL BLOCK DIAGRAM
VDD
12-/10-/8-BIT
VIN
SUCCESSIVE
T/H APPROXIMATION
ADC
AD7276/
AD7277/
AD7278
CONTROL
LOGIC
SCLK
SDATA
CS
GND
Figure 1.
Table 1.
Part Number
AD7276
AD7277
AD7278
AD72741
AD72731
Resolution
12
10
8
12
10
Package
8-Lead MSOP 6-Lead TSOT
8-Lead MSOP 6-Lead TSOT
8-Lead MSOP 6-Lead TSOT
8-Lead MSOP 8-Lead TSOT
8-Lead MSOP 8-Lead TSOT
1 Part contains external reference pin.
PRODUCT HIGHLIGHTS
1. 3 MSPS ADCs in a 6-lead TSOT package.
2. AD7476/AD7477/AD7478 and AD7476A/AD7477A/
AD7478A pin-compatible.
3. High throughput with low power consumption.
4. Flexible power/serial clock speed management. This allows
maximum power efficiency at low throughput rates.
5. Reference derived from the power supply.
6. No pipeline delay. The parts feature a standard successive
approximation ADC with accurate control of the sampling
instant via a CS input and once-off conversion control.
Rev. C
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
www.analog.com
Fax: 781.461.3113 © 2005–2011 Analog Devices, Inc. All rights reserved.






AD7276 Datasheet, Funktion
AD7276/AD7277/AD7278
AD7277 SPECIFICATIONS
VDD = 2.35 V to 3.6 V, fSCLK = 48 MHz, fSAMPLE = 3 MSPS, TA = TMIN to TMAX, unless otherwise noted.
Table 3.
Parameter
DYNAMIC PERFORMANCE
Signal-to-Noise + Distortion (SINAD)3
Total Harmonic Distortion (THD)3
Peak Harmonic or Spurious Noise (SFDR)3
Intermodulation Distortion (IMD)3
Second-Order Terms
Third-Order Terms
Aperture Delay
Aperture Jitter
Full Power Bandwidth
DC ACCURACY
Resolution
Integral Nonlinearity3
Differential Nonlinearity3
Offset Error3
Gain Error3
Total Unadjusted Error (TUE)3
ANALOG INPUT
Input Voltage Ranges
DC Leakage Current
Input Capacitance
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 Capacitance4
Output Coding
CONVERSION RATE
Conversion Time
Track-and-Hold Acquisition Time3
Throughput Rate
A Grade1, 2 B Grade1, 2 Unit
60.5 60.5 dB min
−70 −1
dB max
−76 −76 dB typ
−80 −80 dB typ
Test Conditions/Comments
fIN = 1 MHz sine wave
−82
−82
dB typ
fa = 1 MHz, fb = 0.97 MHz
−82
−82
dB typ
fa = 1 MHz, fb = 0.97 MHz
5 5 ns typ
18 18 ps typ
74
74
MHz typ
@ 3 dB
10
10
MHz typ
@ 0.1 dB
10 10 Bits
±0.5 ±0.5 LSB max
±0.5
±0.5
LSB max
Guaranteed no missed codes to 10 bits
±1.5 ±1
LSB max
±2 ±1.5 LSB max
±2.5 ±2.5 LSB max
0 to VDD
±1
±5.5
42
10
0 to VDD
±1
±5.5
42
10
V
μA max
μA max
pF typ
pF typ
−40°C to +85°C
85°C to 125°C
When in track
When in hold
1.7
1.7
V min
2.35 V ≤ VDD ≤ 2.7 V
2
2
V min
2.7 V < VDD ≤ 3.6 V
0.7
0.7
V max
2.35 V ≤ VDD ≤ 2.7 V
0.8
0.8
V max
2.7 V < VDD ≤ 3.6 V
±1
±1
μA max
Typically 10 nA, VIN = 0 V or VDD
2 2 pF typ
VDD − 0.2
VDD − 0.2
V min
0.2 0.2 V max
±2.5 ±2.5 μA max
4.5 4.5 pF typ
Straight (natural) binary
ISOURCE = 200 μA, VDD = 2.35 V to 3.6 V
ISINK = 200 μA
250
250
ns max
12 SCLK cycles with SCLK at 48 MHz
60 60 ns min
3.45 3.45 MSPS max SCLK at 48 MHz
Rev. C | Page 5 of 28

6 Page









AD7276 pdf, datenblatt
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 6.
Parameters
VDD to GND
Analog Input Voltage to GND
Digital Input Voltage to GND
Digital Output Voltage to GND
Input Current to Any Pin Except Supplies1
Operating Temperature Range
Commercial (B grade)
Storage Temperature Range
Junction Temperature
6-Lead TSOT Package
θJA Thermal Impedance
θJC Thermal Impedance
8-Lead MSOP Package
θJA Thermal Impedance
θJC Thermal Impedance
Lead Temperature Soldering
Reflow (10 sec to 30 sec)
Lead Temperature Soldering
Reflow (10 sec to 30 sec)
ESD
Ratings
−0.3 V to +6 V
−0.3 V to VDD + 0.3 V
−0.3 V to +6 V
−0.3 V to VDD + 0.3 V
±10 mA
−40°C to +125°C
−65°C to +150°C
150°C
230°C/W
92°C/W
205.9°C/W
43.74°C/W
255°C
260°C
1.5 kV
1 Transient currents of up to 100 mA cause SCR latch-up.
AD7276/AD7277/AD7278
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. C | Page 11 of 28

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