The LMH32404-Q1 is a quad-channel, single-ended-input to differential-output transimpedance amplifier (TIA) for light detection and ranging (LIDAR) applications and laser distance measurement systems.
The LMH32404-Q1 has an integrated 100-mA clamp on each channel that protects the amplifier and allows the device to recover rapidly from an overloaded input condition. The LMH32404-Q1 also features an integrated ambient light cancellation (ALC) circuit on each channel that can be used instead of AC coupling between the photodiode and the amplifier to save board space and system cost. The ALC loop should be disabled when DC and low frequency content is measured.
Each LMH32404-Q1 channel has integrated switches on the output to disconnect the differential output amplifier from the output pins and put the channel in standby mode. When switching between different channels, the transistion time is only 10 ns. The LMH32404-Q1 can be placed in low-power mode using the EN pin to conserve power when the amplifier is not being used.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LMH32404-Q1 | VQFN (28) | 5.00 mm × 4.00 mm |
Changes from Revision * (December 2020) to Revision A (November 2021)
PIN | TYPE(2) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
EN | 9 | I | Device enable pin. EN = logic low = normal operation (default); EN = logic high = low power mode.(1) |
GND | 11, 26 | I | Amplifier ground. |
IDC_EN | 28 | I | Ambient light cancellation loop enable. IDC_EN = logic low = enable DC cancellation (default); IDC_EN = logic high = disable DC cancellation.(1) |
IN1 | 1 | I | Transimpedance amplifier input - Channel 1. |
IN2 | 3 | I | Transimpedance amplifier input - Channel 2. |
IN3 | 6 | I | Transimpedance amplifier input - Channel 3. |
IN4 | 8 | I | Transimpedance amplifier input - Channel 4. |
M1 | 25 | I | Select Channel 1. M1 = logic high = Channel 1 operational and output switches closed. M1 = logic low (default) = Channel 1 in standby power mode and output switches open. (1) |
M2 | 24 | I | Select Channel 2. M2 = logic high = Channel 2 operational and output switches closed. M2 = logic low (default) = Channel 2 in standby power mode and output switches open. (1) |
M3 | 13 | I | Select Channel 3. M3 = logic high = Channel 3 operational and output switches closed. M3 = logic low (default) = Channel 3 in standby power mode and output switches open. (1) |
M4 | 12 | I | Select Channel 4. M4 = logic high = Channel 4 operational and output switches closed. M4 = logic low (default) = Channel 4 in standby power mode and output switches open. (1) |
OUT1– | 22 | O | Channel 1 inverting amplifier output. When light is incident on the photodiode the output pin transitions in a negative direction from the no light condition. |
OUT1+ | 21 | O | Channel 1 noninverting amplifier output. When light is incident on the photodiode the output pin transitions in a positive direction from the no light condition. |
OUT2– | 20 | O | Channel 2 inverting amplifier output. When light is incident on the photodiode the output pin transitions in a negative direction from the no light condition. |
OUT2+ | 19 | O | Channel 2 noninverting amplifier output. When light is incident on the photodiode the output pin transitions in a positive direction from the no light condition. |
OUT3– | 18 | O | Channel 3 inverting amplifier output. When light is incident on the photodiode the output pin transitions in a negative direction from the no light condition. |
OUT3+ | 17 | O | Channel 3 noninverting amplifier output. When light is incident on the photodiode the output pin transitions in a positive direction from the no light condition. |
OUT4– | 16 | O | Channel 4 inverting amplifier output. When light is incident on the photodiode the output pin transitions in a negative direction from the no light condition. |
OUT4+ | 15 | O | Channel 4 noninverting amplifier output. When light is incident on the photodiode the output pin transitions in a positive direction from the no light condition. |
VDD1 | 2, 4, 5, 7 | I | Positive power supply for the transimpedance amplifier stage. Each pin should be tied to the same power supply with independent power-supply bypassing. |
VDD2 | 14, 23 | I | Positive power supply for the differential amplifier stage. Tie VDD1 and VDD2 to the same power supply with independent power-supply bypassing. |
VOCM | 27 | I | Differential amplifier common-mode output control. |
VOD | 10 | I | Differential amplifier differential output offset control. |
Thermal pad | — | Connect the thermal pad to the same potential as pin 11 and 26 (GND). |
MIN | MAX | UNIT | ||
---|---|---|---|---|
VDD1, VDD2 | Total supply voltage, (VDD)(2) | 3.65 | V | |
Voltage at Output pins | 0 | VDD | V | |
Voltage at Logic pins | –0.2 | VDD | V | |
IIN | Continuous current into IN | 25 | mA | |
IOUT | Continuous output current | 35 | mA | |
TJ | Junction temperature | 150 | °C | |
TA | Operating free-air temperature | –40 | 125 | °C |
Tstg | Storage temperature | –65 | 150 | °C |
VALUE | UNIT | ||||
---|---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human body model (HBM), per AEC Q100-002(1) | ±1500 | V | |
Charged device model (CDM), per AEC Q100-011 | ±1000 |