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MAX3806

Receiver for Optical Distance Measurement

________________________________________________________________

Maxim Integrated Products

19-4700; Rev 0; 7/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

General Description

The MAX3806 is a high-gain linear preamplifier for dis-

tance measurement applications using a laser beam.

The device operates from a single +5.0V supply and

converts current from an AC-coupled photodiode into a

single-ended voltage signal. The input accepts single

pulses or bursts of pulses with widths down to 30ns.

The amplifier remains linear with input amplitudes from

42nA

(SNR = 3) to 40µA

. It can also withstand over-

load signals as large as 2mA

. The output stage is

designed to drive a high-impedance load to deliver the

output-voltage swing at the lowest possible power dis-

sipation. The gain of the preamplifier stage is selected

using the GAIN pin to be 60kΩ or 30kΩ. There is also

an internal 14dB attenuator that is selected using the

ATT pin. The output stage can be disabled (high

impedance).

The device is available in a 3mm x 3mm, 12-pin TQFN

package and operates over the -40°C to +105°C tem-

perature range.

Applications

LIDAR Sensors for Automotive Applications

(ACC, Stop&Go)

Laser Sensors for Portable Distance

Measurement

Laser Sensors for Industrial Applications

Features

♦ +5V Supply Voltage

♦ Linearity Range Up to 40µA

♦ Overload Current Up to 2mA

♦ 50mW Power Dissipation at +5.0V

♦ 1.5pA/

√

Hz Noise Density at 60kΩ Gain

♦ 14nA

RMS

Input-Referred Noise at 60kΩ Gain

♦ Selectable Gains (60kΩ, 30kΩ)

♦ Selectable 14dB Attenuation

Ordering Information

+5V

SINGLE-CHANNEL RECEIVER

* L AND C SET THE LOW-FREQUENCY CUTOFF REQUIRED FOR THE APPLICATION.

+5V

OUT

BUFF

GAIN

0.01μF

MAX3806

LINEAR LIDAR Rx

MAX1446

ADC

SUPPLY FILTER

GNDATTDIS

+5V TO +12V

SUPPLY FILTER

Typical Application Circuits

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX3806GTC+ -40°C to +105°C 12 TQFN-EP* ABN

Pin Configuration appears at end of data sheet.

Typical Application Circuits continued at end of data sheet.

Summary of content (9 pages)

PAGE 1
9-4700; Rev 0; 7/09 KIT ATION EVALU E L B A AVAIL Receiver for Optical Distance Measurement Features The MAX3806 is a high-gain linear preamplifier for distance measurement applications using a laser beam. ♦ +5V Supply Voltage ♦ Linearity Range Up to 40µAP The device operates from a single +5.0V supply and converts current from an AC-coupled photodiode into a single-ended voltage signal. The input accepts single pulses or bursts of pulses with widths down to 30ns.
PAGE 2
MAX3806 Receiver for Optical Distance Measurement ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (TA = +70°C) 12-Pin TQFN-EP (derate 16.7mW/°C above +70°C)...1333mW Storage Temperature Range .............................-55°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Supply Voltage Range, VCC........................................-0.5V to +6.0V Voltage Range at ATT, DIS, GAIN ................-0.5V to (VCC + 0.5V) Current Range at IN, OUT ..................
PAGE 3
Receiver for Optical Distance Measurement (VCC = +4.5V to +5.5V, AC-coupled (C = 0.01µF) output load ≥ 2kΩ, TA = -40°C to +105°C. Typical values are at VCC = +5V, TA = +25°C, unless otherwise noted.
PAGE 4
Typical Operating Characteristics (continued) (Typical values are at VCC = +5V, TA = +25°C, CIN = 5pF, ATT = 0, unless otherwise noted.) 30 20 TA = +105 NC 10 30 20 7 9 11 13 15 MAX3806 toc06 MAX3806 toc05 0.8 0.6 GAIN = 0 0.4 VCC = +4.5V 0.2 GAIN = 1 0 0 5 5 7 9 11 13 5 15 7 9 11 INPUT CAPACITANCE (pF) INPUT CAPACITANCE (pF) BANDWIDTH vs. INPUT CAPACITANCE (GAIN = 0) BANDWIDTH vs.
PAGE 5
Receiver for Optical Distance Measurement TA = +25NC 22 21 20 TA = -40NC 19 25 GAIN = 0 BW = 100MHz VCC = +5.5V 24 23 VCC = +5.0V 22 21 VCC = +4.5V 20 700 TA = +25NC OUTPUT-REFERRED NOISE (µVRMS) 23 TA = +25NC OUTPUT-REFERRED NOISE vs. INPUT CAPACITANCE MAX3806 toc14 TA = +105NC 24 26 INPUT-REFERRED NOISE (nARMS) 25 GAIN = 0 BW = 100MHz MAX3806 toc13 VCC = +5V 650 GAIN = 0 BW = 100MHz VCC = +5.5V VCC = +5.0V 600 550 VCC = +4.
PAGE 6
MAX3806 Receiver for Optical Distance Measurement Typical Operating Characteristics (continued) (Typical values are at VCC = +5V, TA = +25°C, CIN = 5pF, ATT = 0, unless otherwise noted.) TRANSIENT RESPONSE (OVERLOAD REGION, GAIN = 1) TRANSIENT RESPONSE (OVERLOAD REGION, GAIN = 1) TRANSIENT RESPONSE (LINEAR REGION, GAIN = 1) MAX3806 toc22 MAX3806 toc21 MAX3806 toc20 ZOOM OUT ZOOM IN 1µAP 2mAP 2mAP IN OUT IN IN OUT OUT 60µs SETTLING TIME 60mVP 1.4VP 1.4VP 0.
PAGE 7
Receiver for Optical Distance Measurement PIN NAME FUNCTION 1, 12 VCC 2 IN 3, 4 GND Supply Ground 5 ATT CMOS/TTL Input. Assert this pin high to enable a 14dB attenuator in the amplifier. Force this pin low to disable the attenuator. Contains internal 40k pulldown resistor. Connect to GND if not used. 6, 8, 11 N.C. Not Connected. This pin is not internally connected. 7 GAIN CMOS/TTL Input. Selects amplifier gain setting. Force high for 60k . Force low for 30k .
PAGE 8
Receiver for Optical Distance Measurement 200Ω VCC made to either the GAIN or ATT setting. Table 2 provides typical output common-mode voltages for the combination of settings. Settling time is proportional to the RC time constant set by the output DC-blocking capacitor, load, and MAX3806 output impedance. For example, a 0.01µF DC-blocking capacitor, 2kΩ load, and 51Ω output impedance provide an RC time constant of approximately 20µs.
PAGE 9
Receiver for Optical Distance Measurement +5V +5V TO +12V SUPPLY FILTER SUPPLY FILTER VCC +5V 7kΩ PIN 0.01μF MAX3806 IN OUT LINEAR LIDAR Rx C* 3kΩ L* GAIN DIS ATT GND +5V MULTIPLE-CHANNEL RECEIVER DIS0 +5V +5V TO +12V SUPPLY FILTER SUPPLY FILTER VCC +5V 7kΩ PIN +5V 0.01μF MAX3806 IN OUT LINEAR LIDAR Rx C* 3kΩ L* DIS GAIN ATT GND MAX4311 4:1 MUX/AMP +5V IN0 DIS1 0.01μF 0.01μF IN1 MAX1446 BUFF IN2 +5V ADC IN3 +5V TO +12V SUPPLY FILTER SUPPLY FILTER VCC 0.