TL4050_16 Datasheet, PDF (16/32 Pages) Texas Instruments – PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE

TL4050
SLOS486A – JUNE 2007 – REVISED AUGUST 2009........................................................................................................................................................ www.ti.com
APPLICATION INFORMATION
R_S
V_IN
TL4050
V_Z
1-Hz Rate
Figure 1. Start-Up Test Circuit
Output Capacitor
The TL4050 does not require an output capacitor across cathode and anode for stability. However, if an output
bypass capacitor is desired, the TL4050 is designed to be stable with all capacitive loads.
SOT-23 Pin Connections
There is a parasitic Schottky diode connected between pins 2 and 3 of the SOT-23 packaged device. Thus, pin 3
of the SOT-23 package must be left floating or connected to pin 2.
Use With ADCs or DACs
The TL4050x-41 is designed to be a cost-effective voltage reference as required in 12-bit data-acquisition
systems. For 12-bit systems operating from 5-V supplies, such as the ADS7842 (see Figure 2), the TL4050x-41
(4.096 V) permits operation with an LSB of 1 mV.
0 V to V_REF
5V
909
TL4050A-41
+
2.2 µF
ADS7842
1 AIN0
V_ANA 28
2 AIN1
3 AIN2
V_DIG 27
A1 26
4 AIN3
A0 25
5 VREF
CLK 24
6 _{AGND BUSY 23}
7 DB11
WR 22
8 DB10
CS ²¹
9 DB9
RD 20
10 DB8
DB0 19
11 DB7
DB1 18
+
0.1 µF
+
5-V Analog Supply
10 µF
3.2-MHz Clock
BUSY Output
Write Input
Read Input
12 DB6
DB2 17
13 DB5
14 DGND
DB3 16
DB4 15
Figure 2. Data-Acquisition Circuit With TL4050x-41
16
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