TLV9004 Operational Amplifiers Pin Configuration | TLV9004 Op-Amp apps
The TLV900x operational amplifiers are offered with special features such as unit gain stabilization, built-in EMI and RFI rejection filters, and phaseless reversal in overclocked conditions. These are primarily designed to simplify the circuit. The TLV900X series of operational amplifiers includes the TLV9001 (single-channel op-amp), TLV9002 (two-channel op-amp), and TLV9004 (four-channel low-voltage op-amp). This article provides a brief description of the TL9004 Op-Amp, technical features, circuit diagram, and applications.
What is TLV9004 Op-Amp?
The TLV9004 op-amp is a low voltage operational amplifier, which comes within the TLV900x op-amps family designed by Texas Instruments. Generally, they are specifically designed for low power, rail-to-rail output and input capabilities for portable electronic applications. Class AB output stage can drive a load less than or equal to 10 kOhm loads, which are connected at any point between positive voltage (V+) and negative voltage (V-).
TLV9004 Op-Amp
The common mode input voltage range includes the input and output rails allowing the TLV900x op-amp to be used in any type of single supply application. The TLV9004 op-amp is a four-channel low-voltage operational amplifier with rail-to-rail inputs and output swing capabilities.
It is primarily used in space-oriented applications such as wearable electronics, smoke detectors, and small electronic devices where high capacitance load drive and low voltage operation are essential. The operating voltage range is between 1.8V and 5.5V.
The TLV9004 Op-amp is a 14-pin operational amplifier available in a 16-pin PW package, a RUC package, and an RTE package in WQFN. It has four positive output voltage pins, four negative output voltage pins, one supply pin, and one ground pin. The configuration of the TLV9004 op-amp pin/pin diagram is illustrated below.
TLV9004 Op-Amp Pin Configuration
Pins 1,7,8,14 - (output voltage pins for four operational amplifiers): OUT1 is the output voltage for channel 1, OUT2 is the output voltage for channel 2, OUT3 is the output voltage for channel 3 and, OUT4 is the output voltage for channel 4.
Pins 2,6,9,13 - (reversing the input voltage pins of four operational amplifiers): IN1- Reverses the input voltage of channel 1, IN2- Reverses the input of channel 2, IN3- Reverses the input voltage of channel 3 and IN4- Reverses the input voltage For channel 4 amps.
Pins 3,5,10,12 - (non-inverting input voltage pins for four operational amplifiers): IN1 + is the non-inverting input voltage for channel 1, IN2 + is the non-inverting input voltage for channel 2, IN3 + is the non-inverting input voltage for channel 3 , and IN4+ is the non-inverting input voltage of channel 4 op-amp.
Pin4 (VDD (V+)): Positive rail or voltage source (high).
Pin11 (Vss (V-)): negative rail or ground pin (low voltage source).
TLV9004 Operational Amplifiers Features and Specifications:
The TLV9004 Op-Amp specifications or technical features are described below.
The operating voltage range of the TLV9004 op-amp is between 1.8V and 5.5V
Low input compensation voltage at ±0.4V
The input bias current is low, i.e. 5 Pa
Quiet current is low, i.e. 60 mA/sec
Gives gain unit bandwidth: 1MHz
The broadband noise is low, which can be 27 NV/Hz
Extended operating temperature range is -40°C to +125°C
These types of Op-Amps are available in several packages such as 14-pin PDIP, PDSO, and GDIP.
The MCP6004 Op-Amp is equivalent or alternative to the TLV9004 Op-Amp while the LM324 and TL084 are the other four-channel equivalent amplifiers.
How to use the TLV9004 Op-Amp/Circuit Diagram:
To understand how to use the TLV9004 op-amp, a simple single-width optical amplifier circuit is considered. The circuit diagram of a single supply optical amplifier using the TLV9002 op-amp is shown below.
Single supply optical amplifier circuit
To convert light energy (signals) into electrical energy (signals), photodiodes are used. The energy of the absorbed photon is proportional to the current through the photodiode, which is in the range of a few hundred picofarads to a few tens of microamperes. To convert the low-level photodiode current into a voltage signal that is used for processing in the MCU, the amplifier circuit is designed in a transient impedance configuration.
Below are the components required to design a single-supply photovoltaic amplifier circuit,
3.3 Supply Voltage
0 mA to 10 mA
0.1V to 3.2V output
Bandwidth 50 kHz
TLV9002 Op Amp
11.5 kOhm, 309 kOhm, 357 kOhm 10 kOhm resistors
47 picofarad, 10 picofarad capacitors.
The equation between input current (Iin), output voltage (Vout), and reference voltage (Vref) gives the shunt function as shown below
Voice = Iin x Rf x Vref
where Vref = V + (R1R2 / R1 + R2)
Rf = feedback resistance
To get the minimum output voltage, the Vref is set to 100 mA by adjusting the values \u200b\u200bof the resistor R1 and R2. Then the ratio is calculated as,
Vref / V + = 0.1 V / 3.3 V = 0.0303 V
To achieve this ratio, set the resistors R1 to 11.5 kOhms and R2 to 357 Ohms.
Based on the required input current and output voltage, the required feedback resistance is calculated as follows.
Rf = (Vout - Vref) / Iin = (3.2 - 0.1) / 10 mA = 310 kVA = 308 kOhm
Based on the feedback resistance Rf and -3dB bandwidth, the required value of the feedback capacitor is calculated as shown below,
Cf = 1 / (2Ï€ x Rf x F at -3 dB)
= 1 / (2Ï€ x 309 x 50) = 10.3 picofarad = 10 picofarad
The minimum bandwidth required by the op-amp to apply this circuit depends on the Cf, Rf and capacitance on the input pin of the TLV9002 op-amp. The sum of the photodiode shunt capacitance (Cpd), common mode input capacitance (Ccm), and differential input capacitance (Cd) gives the value of the input capacitance shunt capacitance (Cin) value of the input capacitance (Cin) of the TLV9002, which is given below,
Cin = Cpd + Ccm + Cd = 47 pF + 5 pF + 53pF = 53 pF
The formula used to calculate the minimum bandwidth of an op-amp is given below,
F> = (Cin + Cf) / (2Ï€ x Rf x Cf^2) > = 324 kHz
Hence we can conclude that the bandwidth of 1MHz for the TLV900x is used to meet the minimum bandwidth required and remains constant in this configuration. To reduce coupling errors from high impedance power supply and noise signals, a 0.1 pF bypass capacitor is connected near the power supply pins.
Where to use TLV9004 Op-Amp / Applications:
Applications of Tlv9004 op-amp are listed below
power units
sensor signal conditioning
Motion and smoke detectors
Small and large appliances
wearable devices
barcode scanners
personal electronic systems
HVAC Systems (Heating, Ventilation and Air Conditioning Systems)
motor control systems and
Active Filters
Low Side Current Sensing Circuits
Thus, the TLV9004 op-amps operate between 1.8 to 5.5 volts in the 40°C to 125°C temperature range with many specifications such as quiescent current, offset current, short current and internal displacement voltage. Here is a question for you, “What are the advantages of the TLV9004 Op-Amps?”.
0 Comments
Post a Comment