Datasheet ADA4806-1 (Analog Devices)

0.2 µV/°C Offset Drift, 105 MHz, Low Power, Multimode, Rail-to-Rail Amplifier Data Sheet ADA4806-1 FEATURES TYPICAL APPLICATIONS CIRCUIT Ultralow supply current 5V Full power mode: 500 µA 2.5V REF ADA4806-1 VDD Sleep mode: 74 µA C2 C3 C4 10µF 0.1µF 100nF Shutdown mode: 2.9 µA Dynamic power scaling 5V Turn-on time from shutdown mode: 1.5 µs 0V TO V ADA4806-1 REF REF VDD IN+ Turn-on time from sleep mode: 0.45 µs R3 AD7980 20Ω IN– High speed performance with dc precision GND
001
C1 Input offset voltage: 125 µV maximum 2.7nF
13391-
Input offset voltage drift: 1.5 µV/°C maximum
Figure 1. Driving the AD7980 with the ADA4806-1
−3 dB bandwidth: 105 MHz
Sleep mode reduces the amplifier quiescent current to 74 µA
Slew rate: 160 V/ µs
and provides a fast turn-on time of only 0.45 µs, enabling the
Low noise and distortion
use of dynamic power scaling for sample rates approaching
5.9 nV/√Hz input voltage noise with 8 Hz 1/f corner
2 MSPS. For additional power savings at lower samples rates,
−102 dBc/−126 dBc HD2/HD3 at 100 kHz
the shutdown mode further reduces the quiescent current to
Wide supply range: 2.7 V to 10 V
only 2.9 µA.
Small package: 8-lead SOT-23
The ADA4806-1 operates over a wide range of supply voltages
APPLICATIONS
and is fully specified at supplies of 3 V, 5 V and ±5 V. This
Portable and battery-powered instruments and systems
amplifier is available in a compact, 8-lead SOT-23 package and
High channel density data acquisition systems
is rated to operate over the industrial temperature range of
Precision analog-to-digital converter (ADC) drivers
−40°C to +125°C.
Voltage reference buffers 3.5 Portable point of sales terminals Active RFID readers 3.0 ) GENERAL DESCRIPTION mW 2.5 N (
The ADA4806-1 is a high speed, voltage feedback, rail-to-rail
IO T
output, single operational amplifier with three power modes:
P 2.0 SHUTDOWN MODE UM
full power mode, sleep mode, and shutdown mode. In full
NS 1.5
power mode, this amplifier provides a wide bandwidth of 105 MHz
R CO
at a gain of +1, a fast slew rate 160 V/μs, and excel ent dc precision
E W 1.0
with a low input offset voltage of 125 μV (maximum) and an input
O SLEEP MODE P
offset voltage drift of 1.5 μV/°C (maximum), while consuming
0.5
only 500 μA of quiescent current. Despite being a low power 1
0
amplifier, the ADA4806-1 provides excellent overal 1 6
1 10 100 1000
performance, making it ideal for low power, high resolution
ADC SAMPLE RATE (ksps)
13391- data conversion systems. Figure 2. Quiescent Power Dissipation vs. ADC Sample Rate, Using Dynamic Power Scaling for the Two Low Power Modes For data conversion applications where minimizing power dissipation is paramount, the ADA4806-1 offers a method to
Table 1. Complementary ADCs to the ADA4806-1
reduce power by dynamical y scaling the quiescent power of the
Throughput Resolution SNR
ADC driver with the sampling rate of the system by switching the
Product ADC Power (mW) (MSPS) (Bits) (dB)
amplifier to a lower power mode between samples. AD7980 4.0 1 16 90.51 AD7982 7.0 1 18 98 AD7984 10.5 1.33 18 98.5 1 This SNR value is for the A Grade version of the AD7980.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATIONS CIRCUIT TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ±5 V SUPPLY 5 V SUPPLY 3 V SUPPLY ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE MAXIMUM POWER DISSIPATION ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS THEORY OF OPERATION AMPLIFIER DESCRIPTION INPUT PROTECTION SHUTDOWN/SLEEP MODE OPERATION NOISE CONSIDERATIONS APPLICATIONS INFORMATION SLEW ENHANCEMENT EFFECT OF FEEDBACK RESISTOR ON FREQUENCY RESPONSE COMPENSATING PEAKING IN LARGE SIGNAL FREQUENCY RESPONSE DRIVING LOW POWER, HIGH RESOLUTION SUCCESSIVE APPROXIMATION REGISTER (SAR) ADCs DYNAMIC POWER SCALING SINGLE-ENDED TO DIFFERENTIAL CONVERSION LAYOUT CONSIDERATIONS Ground Plane Power Supply Bypassing OUTLINE DIMENSIONS ORDERING GUIDE