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PDF MAX1932 Data sheet ( Hoja de datos )
| Número de pieza | MAX1932 | |
| Descripción | Digitally Controlled / 0.5% Accurate / Safest APD Bias Supply | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2555; Rev 1; 12/02
Digitally Controlled, 0.5% Accurate, Safest APD
Bias Supply
General Description
The MAX1932 generates a low-noise, high-voltage output
to bias avalanche photodiodes (APDs) in optical
receivers. Very low output ripple and noise is achieved by
a constant-frequency, pulse-width modulated (PWM)
boost topology combined with a unique architecture that
maintains regulation with an optional RC or LC post filter
inside its feedback loop. A precision reference and error
amplifier maintain 0.5% output voltage accuracy.
The MAX1932 protects expensive APDs against adverse
operating conditions while providing optimal bias.
Traditional boost converters measure switch current for
protection, whereas the MAX1932 integrates accurate
high-side current limiting to protect APDs under
avalanche conditions. A current-limit flag allows easy cali-
bration of the APD operating point by indicating the pre-
cise point of avalanche breakdown. The MAX1932 control
scheme prevents output overshoot and undershoot to
provide safe APD operation without data loss.
The output voltage can be accurately set with either
external resistors, an internal 8-bit DAC, an external
DAC, or other voltage source. Output span and offset
are independently settable with external resistors. This
optimizes the utilization of DAC resolution for applica-
tions that may require limited output voltage range, such
as 4.5V to 15V, 4.5V to 45V, 20V to 60V, or 40V to 90V.
Applications
Optical Receivers and Modules
Fiber Optic Network Equipment
Telecom Equipment
Laser Range Finders
PIN Diode Bias Supply
Pin Configuration
12 11 10
SCLK 1
9 GND
DIN 2
CL 3
MAX1932
456
8 COMP
7 FB
Features
o Small Circuit Footprint
o Circuit Height < 2mm
o 2.7V to 5.5V Input
o 4.5V to 90V Output
o No Overshoot
o Accurate High-Side Current Limit
o Avalanche Indicator Flag
o 8-Bit SPI-Compatible DAC
o Compatible with External DAC
o 0.5% Accurate Output
o Low Ripple Output (< 1mV)
o Small 12-Pin, 4mm ✕ 4mm Thin QFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1932ETC -40°C to +85°C 12 Thin QFN
Typical Application Circuit
INPUT
2.7V TO 5.5V
VIN
MAX1932
COMP
GATE
DAC INPUTS
AVALANCHE
INDICATOR
FLAG
CS
SCLK
DIN
CS+
CS-
CL
GND
DACOUT
FB
APD BIAS OUTPUT
4.5V TO 90V
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Digitally Controlled, 0.5% Accurate, Safest APD
Bias Supply
(VIN = 5V, Circuit of Figure 2, TA =+25°C, unless otherwise noted)
Typical Operating Characteristics
SWITCHING WAVEFORMS
MAX1932 toc01
VLX
50V/div
SWITCHING WAVEFORM WITH LC FILTER
MAX1932 toc02
VLX
50V/div
STARTUP AND SHUTDOWN WAVEFORMS
MAX1932 toc03
IL
VOUT RIPPLE (AC-COUPLED)
VOUT = 90V
1µs/div
0.05A/div
0.002V/div
IL
VOUT RIPPLE (AC-COUPLED)
VOUT = 90V, L = 300µH, C = 1µF, FIGURE 7
1µs/div
0.05A/div
OUTPUT
VOLTAGE
INPUT
CURRENT
0.002V/div
20ms/div
50V/div
50mA/div
OUTPUT VOLTAGE vs. INPUT VOLTAGE
92
91
90
89
88
2.5
3.5 4.5
INPUT VOLTAGE (V)
5.5
1.2520
VFB vs. TEMPERATURE
1.2515
1.2510
1.2505
1.2500
1.2495
1.2490
1.2485
1.2480
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
OUTPUT VOLTAGE STEP-DOWN
DUE TO DAC CHANGE
MAX1932 toc07
OFFSET = 62.962V = 88 hex
STEP DOWN FROM 80 hex TO 88 hex
OUTPUT VOLTAGE STEP-UP
DUE TO DAC CHANGE
MAX1932 toc08
OFFSET = 62.962V = 88 hex
STEP VALUE = 64.233 = 80 hex
VOUT AT
64.233V
VOUT AT
1V/div 62.692V
OFFSET
1V/div
OUTPUT VOLTAGE vs. LOAD CURRENT
95
90
85
CURRENT LIMIT
ACTIVATED
80
75
70
65
60
VCC = 5V, INDUCTOR = 100µH,
R1 = 806Ω
55 FEEDBACK DIVIDER CURRENT AND CS-
CURRENT INCLUDED
50
0 0.5 1.0 1.5 2.0 2.5
LOAD CURRENT (mA)
3.0
OUTPUT VOLTAGE STEP
DUE TO DACOUT CHANGE
MAX1932 toc09
20V/div
DACOUT EXTERNAL SOURCE
0.5V/div
10ms/div
10ms/div
20ms/div
_______________________________________________________________________________________ 5
5 Page 
Digitally Controlled, 0.5% Accurate, Safest APD
Bias Supply
R7
20kΩ
C4
0.22µF
INPUT
2.7V TO 5.5V
CL VIN
COMP
C1 1µF
MAX1932
CS
SCLK
GATE
N1
BSS123
CS+
CS-
L1
100µH
D1
100V
C2
0.047
DIN
GND
DACOUT
FB
R6
24.9kΩ
Figure 2. Typical Operating Circuit
R1
806Ω
VOUT
40V TO 90V
C3
0.1µF
R5
1MΩ
R8
32.4kΩ
VOUT
GATE
FB
MAX1932
CS+
CS-
Figure 3. Taking Feedback Ahead of Output Filter
INSTRUCTION
EXECUTED
CS
SCLK
DIN
18
D7 D6 D5 D4 D3 D2 D1 DO
Figure 4. Serial Interface Timing Diagram
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX1932.PDF ] | |
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