LMH32404-Q1 Automotive Four-Channel, Differential Output, Multiplexed
Transimpedance Amplifier With Integrated Clamping and Ambient Light Cancellation
1 Features
• AEC-Q100 qualified for automotive applications:
– Temperature grade 1: –40°C to +125°C, T
A
• Gain: 20 kΩ
• Performance, C
PD
= 1 pF:
– Bandwidth: 350 MHz
– Input-referred noise: 56 nA
RMS
– Rise, fall time: 1.25 ns
• Quiescent current: 28 mA/channel
• Standby mode: 10 mA/channel
• Low power mode: 2.5 mA (4 channels)
• Channel switching time: 10 ns
• Integrated ambient light cancellation
• Integrated 100-mA protection clamp
• 4 Input channels and 4 differential output channels
• Integrated multiplexer enables flexible
configurability between optical sensor and
ADC/TDC
• Multiple LMH32404s can be combined in parallel
to create a wider field-of-view (FoV)
2 Applications
• Mechanically scanning LIDAR
• Solid-state scanning LIDAR
• Laser distance meter
• Safety area scanner
VOD
VDD1x VDD2
GND
EN
Output Offset
M
1-4
IN1
OUT1í
OUT1+
IN2
OUT3+
OUT3í
OUT4í
IN4
OUT4+
IDC EN
Output
Common-Mode
VOCM
TIA
10 NŸ
Ambient Light
Cancellation
+
±
100mA
Clamp
10 Ÿ
10
Ÿ
2x
TIA
10 NŸ
Ambient Light
Cancellation
+
±
100mA
Clamp
10 Ÿ
10
Ÿ
2x
OUT2í
OUT2+
TIA
10 NŸ
Ambient Light
Cancellation
+
±
100mA
Clamp
10 Ÿ
10
Ÿ
2x
TIA
10 NŸ
Ambient Light
Cancellation
+
±
100mA
Clamp
10 Ÿ
10
Ÿ
2x
IN3
Simplified Block Diagram
3 Description
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 10ns. The
LMH32404-Q1 can be placed in low-power mode
using the EN pin to conserve power when the
amplifier is not being used.
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
LMH32404-Q1 VQFN (28) 5.00 mm × 4.00 mm
(1) For all available packages, see the package option
addendum at the end of the data sheet.
.
.
Closed-Loop Bandwidth
LMH32404-Q1
SBOSA63A – DECEMBER 2020 – REVISED NOVEMBER 2021
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.
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