THS4521 Datasheet, PDF (1/65 Pages) Texas Instruments – VERY LOW POWER, NEGATIVE RAIL INPUT, RAIL-TO-RAIL OUTPUT, FULLY DIFFERENTIAL AMPLIFIER

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THS4521, THS4522, THS4524
SBOS458H – DECEMBER 2008 – REVISED JUNE 2015
THS452x Very Low Power, Negative Rail Input, Rail-To-Rail Output, Fully Differential
Amplifier
1 Features
•1 Fully Differential Architecture
• Bandwidth: 145 MHz (A_V = 1 V/V)
• Slew Rate: 490 V/μs
• HD₂: –133 dBc at 10 kHz (1 V_RMS, R_L = 1 kΩ)
• HD₃: –141 dBc at 10 kHz (1 V_RMS, R_L = 1 kΩ)
• Input Voltage Noise: 4.6 nV/√Hz (f = 100 kHz)
• THD+N: –112dBc (0.00025%) at 1 kHz (22-kHz
BW, G = 1, 5 V_PP)
• Open-Loop Gain: 119 dB (DC)
• NRI—Negative Rail Input
• RRO—Rail-to-Rail Output
• Output Common-Mode Control (with Low Offset)
• Power Supply:
– Voltage: +2.5 V (±1.25 V) to +5.5 V (±2.75 V)
– Current: 1.14 mA/ch
• Power-Down Capability: 20 μA (typical)
2 Applications
• Low-Power SAR and ΔΣ ADC Drivers
• Low-Power Differential Drivers
• Low-Power Differential Signal Conditioning
• Low-Power, High-Performance Differential Audio
Amplifiers
3 Description
The THS4521, THS4522, and THS4524 family of
devices are very low-power, fully differential
amplifiers with rail-to-rail output and an input
common-mode range that includes the negative rail.
These amplifiers are designed for low-power data
acquisition systems and high-density applications
where power dissipation is a critical parameter, and
provide exceptional performance in audio
applications.
The family includes single FDA (THS4521), dual FDA
(THS4522), and quad FDA (THS4524) versions.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
THS4521
SOIC (8)
VSSOP (8)
4.90 mm × 3.91 mm
3.00 mm × 3.00 mm
THS4522
TSSOP (16)
5.00 mm × 4.40 mm
THS4524
TSSOP (38)
9.70 mm × 4.40 mm
(1) For all available packages, see the package option addendum
at the end of the datasheet.
V_IN+
V_IN-
1 kΩ
1 kΩ
1.5 nF
5V
THS4521
V_OCM
1.5 nF
THS4521 and ADS1278 Combined Performance
1 kΩ
49.9 Ω
49.9 Ω
0.1 μF
1 kΩ
2.2 nF
AINN1
ADS1278 (CH 1)
AINP1 V_COM
x1
1/2
OPA2350
0.1 μF
1-kHz FFT
0
G=1
-20
R_F = R_G = 1 kΩ
C_F = 1.5 nF
-40
V_S = 5 V
-60
Load = 2.2 nF
-80
-100
-120
-140
-160
0
4
8
12
16
20
Frequency (kHz)
24 26
For more information on this circuit, view SBAU197.
Tone
(Hz)
1k
Signal
(dBFS)
-0.50
SNR (dBc) THD (dBc)
109.1
-107.9
SINAD
(dBc)
105.5
SFDR
(dBc)
113.7
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. PRODUCTION DATA.