FEATURES
• Package : 8-pin SOP, 8-pin DIP
• Operating voltage : 2.2V~6V
• Operating temperature : -25oC~60oC
• Supply current : max. 10mA (without output current)
DESCRIPTION
MX171 is designed for Amplitude system auto focus
cameras. It is regarded as input component for SPD
(Silicon Photo Detector), and comprises of circuits that
drive AF magnet as output, an infrared emission diode
current control circuit, and control circuit of sequential
timing.
MX171
AMPLITUDE TYPE AUTO FOCUS IC
• Surround light level : max. 20uA (SPD output current)
• IRED drive output : min. 15mA
• Magnet drive current : min. 300mA
• Measuring time : max. 30ms
PIN CONFIGURATION
8 SOP
GND
2
CH
SPD
VCC
3
4
8
7
6
MX171
5
OUT
IRED
CT
VR
PIN FUNCTIONS
SYMBOL PIN NAME
GND Ground Pin
CH Hold Capacitor Pin
SPD SPD Input Pin
VCC Supply Pin
VR VR Pin for Adjustment
CT Timing Capacitor
IRED Output Control for IRED
OUT Data Output Pin
P/N: PM0167
1
REV 1.2, JAN 05, 1996
BLOCK DIAGRAM
VCC
MX171
AF ADJ.
AF SPD
HEAD AMP
SURROUNDING LIGHT
REJECTION
BASIC CONNECTION DIAGRAM
C2
C1
R3
SPD
REFERENCE
COMPARATOR
SEQUENCE CONTROL CIRCUIT
GND
1
CH
2
SPD
3
VCC
4
SW1
AF.MAG
VR (ADJ)
LATCH
IRED
CT
MAG.
DRIVER
IRED DRIVE CIRCUIT
AF.MAG
8
IRED
7
TR1
6
5
C4
AF .ADJ . VR
33K ~ 50KWW
POWER VCC
AF MAG.
IRED
POWER
GND
R1
C3
R2
P/N: PM0167
NOTE:
C1 = > 47uF
C2 = 0.47uF
C3 = 150uF
C4 = 0.022uF
R1 = 1K ohm~10K ohm
R2 = 1 ohm
R3 = 27K ohm
R4 = 10K ohm
REV 1.2, JAN 05, 1996
2
ABSOLUTE MAXIMUM RATINGS
SYMBOL PARAMETER RATING UNIT CONDITION
VCC Supply Voltage -0.3~6.0 V
PD Power Dissipation 550 mW TA<5
PDR Power Dissipation Ratio -5.5 mW/
VIN Input Voltage -0.3~VCC+0.3 V
BVOC Output Voltage -0.3~6.0 V
IOUT Output Current 40 0 mA
TOPR Operating Temperature 1 -25~+60
TOPR Operating Temperature 2 -10~+50
TSTG Storage Temperature -55~+150
NOTE: The operating temperature 1 range expresses the qualitative
operating temperature range but it does not guarantee characteristics.
o
C TA>25oC
o
C
o
C
o
C
(NOTE)
MX171
o
C
DC CHARACTERISTICS (TA = 25
o
C, VCC = 2.2V, 3.0V, 6.0V)
SUPPLY CURRENT
SYMBOL PARAMETER MIN TYP MAX UNIT CONDITION
ICC1 Quick Charge State (Charge) 1.5 3.2 5.5 mA
ICC2 Quick Charge State (Discharge) 1.8 3.1 6.0 mA
ICC3 Steady State (Charge) 1.2 2.2 4.2 mA
ICC4 Steady State (Discharge) 1.2 2.1 4.0 mA
ICC5 IRED Flashing State 1.2 2.2 4.0 mA
ICC6 Finish State 16.0 40.0 mA output "on"
TIMING CIRCUIT
SYMBOL PARAMETER MIN TYP MAX UNIT CONDITION
ICT CT Charge Current 0.8 1.3 1.8 uA
RCT Discharge Resistance 4.5 7.3 10.0 K ohm
VTH1 Threshold Voltage1 640 680 7 20 mV
VTH2 Threshold Voltage2 1250 1350 1450 mV
P/N: PM0167
3
REV 1.2, JAN 05, 1996
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