THS4521 Datasheet, PDF (1/43 Pages) Texas Instruments – VERY LOW POWER, NEGATIVE RAIL INPUT, RAIL-TO-RAIL OUTPUT, FULLY DIFFERENTIAL AMPLIFIER

THS4522
THS4521
THS4524
THS4521
THS4522
THS4524
www.ti.com.................................................................................................................................................... SBOS458B – DECEMBER 2008 – REVISED MAY 2009
VERY LOW POWER, NEGATIVE RAIL INPUT, RAIL-TO-RAIL OUTPUT,
FULLY DIFFERENTIAL AMPLIFIER
FEATURES
1
•2 Fully Differential Architecture
• Bandwidth: 145 MHz
• Slew Rate: 490 V/µs
• HD₂: –133 dBc at 10 kHz (1 V_RMS, R_L = 1 kΩ)
• HD₃: –140 dBc at 10 kHz (1 V_RMS, R_L = 1 kΩ)
• Input Voltage Noise: 4.6 nV/√Hz (f = 100 kHz)
• NRI—Negative Rail Input
• RRO—Rail-to-Rail Output
• Output Common-Mode Control (with Low
Offset and Drift)
• 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 (typ)
THS4521 and ADS1278 Combined Performance
1 kW
1.5 nF
5V
V_IN+
V_IN-
1 kW
1 kW
49.9 W
THS4521
V_OCM
1.5 nF
49.9 W
0.1 mF
2.2 nF
AINN1
ADS1278 (CH 1)
AINP1 V_COM
x1
1/2
OPA2350
0.1 mF
1 kW
1-kHz FFT
0
G=1
-20
R_F = R_G = 1 kW
-40
C_F = 1.5 nF
V_S = 5 V
-60
Load = 2 x 49.9 W + 2.2 nF
-80
-100
-120
-140
-160
0
4
8
12
16
20
24 26
Frequency (kHz)
Tone
(Hz)
1k
Signal
(dBFS)
-0.50
SNR (dBc) THD (dBc)
109.1
-107.9
SINAD
(dBc)
105.5
SFDR
(dBc)
113.7
APPLICATIONS
• Low-Power SAR and ΔΣ ADC Drivers
• Low-Power Differential Driver
• Low-Power Differential Signal Conditioning
DESCRIPTION
The THS4521, THS4522, and THS4524 family of
devices are very low-power, fully differential op amps
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.
The family includes single (THS4521), dual
(THS4522), and quad (THS4524) versions.
These fully differential op amps feature accurate
output common-mode control that allows for
dc-coupling when driving analog-to-digital converters
(ADCs). This control, coupled with an input
common-mode range below the negative rail as well
as rail-to-rail output, allows for easy interfacing
between single-ended, ground-referenced signal
sources. Additionally, these devices are ideally suited
for driving both successive-approximation register
(SAR) and delta-sigma (ΔΣ) ADCs using only a single
+3V to +5V and ground power supply.
The THS4521, THS4522, and THS4524 family of fully
differential op amps is characterized for operation
over the full industrial temperature range from –40°C
to +85°C.
DEVICE
THS4520
THS4121
THS4130
BW
(MHz)
570
100
150
RELATED
PRODUCTS
I_Q (mA)
15.3
16
16
THD
(dBc)
at 100
kHz
–114
–79
–107
V_N
RAIL-
(nV/√Hz) TO-RAIL
2
Out
5.4
In/Out
1.3
No
1
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2009, Texas Instruments Incorporated