THS4561 Datasheet, PDF (1/35 Pages) Texas Instruments – Low-Power, High Supply Range, 70-MHz, Fully Differential Amplifier

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THS4561
SBOS874 – AUGUST 2017
THS4561 Low-Power, High Supply Range, 70-MHz, Fully Differential Amplifier
1 Features
•1 Bandwidth: 70 MHz (G = 1 V/V)
• Differential Output Slew Rate: 130 V/µs
• Gain Bandwidth Product: 60 MHz
• Negative Rail Input (NRI)
• Rail-to-Rail Output (RRO)
• Wide Output Common-Mode Control Range
• Single-Supply Operating Range: 2.85 V to 12.6 V
• Trimmed-Supply Current: 830 µA at ±5 V
• 25°C Input Offset: ±200 µV (Maximum)
• Input Offset Voltage Drift: ±2 µV/°C (Maximum)
• Differential Input Voltage Noise: 4.5 nV/√Hz
• Very Low 50–Hz 1/f Voltage Noise Corner
• Very Low Harmonic Distortion
– HD2: –115 dBc at 2-V_PP, 100-kHz
– HD3: –110 dBc at 2-V_PP, 100-kHz
• < 4-V Step Response Settling to 0.01%: < 100 ns
2 Applications
• 16-Bit to 20-Bit, Differential, High-Speed SAR
Drivers
• Differential Active Filters
• Differential Transimpedance Amplifiers
• High Output Swing PCM Audio DAC Outputs
• Ultrasound Differential TGC Drivers
• Lower Power Alternate to the THS4551
3 Description
The THS4561 fully differential amplifier (FDA) offers a
simple interface from single-ended sources to the
differential output required by high-precision analog-
to-digital converters (ADCs). Designed for exceptional
dc accuracy, low noise, and ultra-low harmonic
distortion, the device is well suited for data acquisition
systems where high precision is required with the
best signal-to-noise ratio (SNR) and spurious-free
dynamic range (SFDR) through the amplifier and
ADC combination.
The THS4561 features the required negative rail input
when interfacing a dc-coupled, ground-centered,
source signal to a single-supply, differential-input
ADC. Very low dc error and drift terms support the
emerging 16-bit to 20-bit successive approximation
register (SAR) input requirements. A 2.85-V to 12.6-V
supply range with a flexible output common-mode
setting with low headroom to the supplies supports a
wide range of ADC input and digital-to-analog
converter (DAC) output requirements.
The THS4561 will be available in a dual-channel
device as the THS4562 in a VQFN-24 package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
VSSOP (8)
3.00 mm × 3.00 mm
THS4561
VQFN (16)
3.00 mm × 3.00 mm
VQFN (10)
2.00 mm × 2.00 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
Gain of 10 V/V PCM Audio DAC Output With Second-Order MFB Filter at 50 kHz
RF1 12.1 k
C1 91 pF
PCM
Audio DAC
Output
R4 1.21 k
C1 2.7 nF
C2 2.7 nF
R1 1.21 k
R2 3.4 k
THS4561
Using ±5 V
R3 3.4 k
VEE
VCC
PD
FDA
VCC
C2 91 pF
RF2 12.1 k
Av = 10 V/V
50-kHz MFB
Butterworth Output Driver
VCC
+5 V
+
±
VEE
±5 V
+
±
Copyright © 2017, 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. ADVANCE INFORMATION for pre-production products; subject to
change without notice.