Rainbow Electronics MAX3806 User Manual
MAX3806
Receiver for Optical Distance Measurement
________________________________________________________________
Maxim Integrated Products
1
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 distance 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
42nAP(SNR = 3) to 40µAP. It can also withstand overload signals as large as 2mA
P
. The output stage is
designed to drive a high-impedance load to deliver the
output-voltage swing at the lowest possible power dissipation. 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 temperature 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
P
♦ Overload Current Up to 2mA
P
♦ 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
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.
+5V TO +12V
SUPPLY FILTER
PIN
IN
C*
L*
* L AND C SET THE LOW-FREQUENCY CUTOFF REQUIRED FOR THE APPLICATION.
SUPPLY FILTER
LINEAR LIDAR Rx
GAIN
+5V
+5V
V
CC
MAX3806
SINGLE-CHANNEL RECEIVER
0.01μF
0.01μF
OUT
GNDATTDIS
BUFF
0.01μF
MAX1446
ADC
MAX3806
Receiver for Optical Distance Measurement
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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,
T
A
= +25°C, unless otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage Range, V
CC........................................
-0.5V to +6.0V
Voltage Range at ATT, DIS, GAIN
................
-0.5V to (VCC+ 0.5V)
Current Range at IN, OUT
...........................................
-4mA to +4mA
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
Power-Supply C urrent ICC (Note 2) 10 15 mA
INPUT SPECIFICATIONS
Input-Referred Noise
Input-Referred Noise Den sity
Input Impedance
CMOS/TTL INPUT SPECIFICATIONS
Input High Voltage V
Input Low Voltage V
Input Current
Input Impedance
GENERAL SPECIFICATIONS
Small-Signal Transimpedance
Small-Signal Bandwidth f
Gain Peaking 5pF CIN 15pF 1 dB
Attenuation Stabil ity ATT = 1; 20log(V
OUTPUT SPECIFICATIONS
Total Harmonic Distortion THD
Power-Supply Noise Rejection
(Note 3)
PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS
Output noise up to
100MHz/(gain at 5MHz)
Output noise centered
at 5MHz over 100H z
band/(gain at 5MHz)
At 1MH z, GAIN = 1 800
At 1MH z, GAIN = 0 300
2 VCC V
IH
0 0.8 V
IL
I
IH,IIL
I
IH
R
PULLUP
R
PULLDOWN
3dB
PSNR Noise frequency < 1MHz
DIS input ±150
GAIN and ATT inputs -180
DIS input 60
GAIN and ATT inputs 40
IIN 15μAP, GAIN = 1 44 60 77
50μAP, GAIN = 0 23 30 37
I
IN
CIN = 5pF
OUT_ATT_ ON/VOUT_ATT_OFF
Frequency = 1MHz,
= 0.5V
V
OUT
Frequency = 10MH z,
V
OUT
= 0.5V
P
P
CIN = 5pF, GAIN = 1 14 20
= 5pF, GAIN = 0 21 27
C
IN
CIN = 5pF, GAIN = 1 1.5 1.8
C
= 5pF, GAIN = 0 1.7 2.3
IN
GAIN = 1, ATT = 0 25 49
GAIN = 0, ATT = 0 55 98
) -13 -14 -15 dB
GAIN = 1 -54
GAIN = 0 -53
GAIN = 1 -38
GAIN = 0 -47
GAIN = 1 -16
GAIN = 0 -23
nA
RMS
pA/Hz
μA
k
k
MHz
dB
dB
MAX3806
Receiver for Optical Distance Measurement
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(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,
T
A
= +25°C, unless otherwise noted.) (Note 1)
Note 1: AC specifications are guaranteed by design and characterization.
Note 2: Supply current is measured with OUT unterminated or AC-coupled.
Note 3: Measured by applying 100mV
P-P
sinusoidal noise to the supply voltage. PSNR is defined as 20log(V
OUT_NOISE/VCC_NOISE
).
Typical Operating Characteristics
(Typical values are at VCC= +5V, TA= +25°C, CIN= 5pF, ATT = 0, unless otherwise noted.)
PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS
Attenuation in Disable Mode
Output Impedance
Frequency < 5MHz,
20log(V
OUT_DISABLED
V
OUT_ENABLED
/
)
At 1MH z, DIS = 0, ATT = 0, GAIN = 0 or 1 51
At 1MH z, DIS = 0, ATT = 1, GAIN = 0 or 1 114
At 1MHz, DIS = 1, ATT = 0 or 1, GAIN = 0
or 1
ATT = 0 -71
dB
ATT = 1 -57
9 k
SUPPLY CURRENT vs. TEMPERATURE
16
14
12
10
8
6
SUPPLY CURRENT (mA)
4
2
0
-40 110
DIS = 0
DIS = 1
TEMPERATURE (NC)
OUTPUT VOLTAGE vs. INPUT CURRENT
10
MAX3806 toc01
)
1
P
GAIN = 0, ATT = 0
0.1
OUTPUT VOLTAGE (V
0.01
0.001
8560-15 10 35
0.1 1000
GAIN = 1, ATT = 0
GAIN = 1, ATT = 1
GAIN = 0, ATT = 1
100101
INPUT CURRENT (µAP)
MAX3806 toc02
105
100
95
90
85
80
75
TRANSIMPEDANCE (dBI)
70
65
60
FREQUENCY RESPONSE
GAIN = 1, ATT = 0
GAIN = 0, ATT = 0
GAIN = 1, ATT = 1
GAIN = 0, ATT = 1
0.1 100
FREQUENCY (MHz)
101
MAX3806 toc03
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