AN2018S PANASONIC | Alldatasheet

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Technical content

Correlated Double Sampling IC n Overview The AN2018S is used to reduce noise in CCD im- age sensor output signal. It performs correlated double- sampling on image signal sent from a CCD sensor to output clearer image signal. n Features

  • Operating on low voltage (VCC =4.8V), consuming little current (ICC =12.7mA typ.)
  • Including a high-speed sampling circuit responding to 510-830H CCD
  • 6dB or 9dB fixed gain
  • 83-dB high S/N-ratio (at 6dB output) 876 5 1234 6dB OUT GND SP1 SP2 9dB OUT BLK SIG.IN V CC 9dB 6dB S / H S / H BLK BIAS 50kW CDS output (9dB) Blanking pulse input CCD signal input V CC Sampling pulse input (2) Sampling pulse input (1) GND CDS output (6dB) Pin No. Pin name pn Pin Descriptions U nit:mm 6.5–0.3 4.2–0.3 0.4–0.25 0.41.270.1–0.1 0.15 0.65 1.5–0.2 5.0–0.3 0.3 8-Pin SOP Package (SOP008-P-0225)

Parameter Symbol Rating Unit V CC ICC PD Topr Tstg Supply voltage Supply current Power dissipation Operating ambient temperature Note 1) Storage temperature Note 1) Note 1) Ta=25˚C except operating ambient temperature and storage temperature. 5.5 –20 to +70 –55 to +125 V mA mW n Absolute Maximum Ratings 16.2 mAICC V 3 V 8 V 1 G 1 Supply current Terminal voltage pin (8) Terminal voltage pin (1) 6dB amp. gain V dB dB Parameter min Condition typ max UnitSymbol Note) The value in the above characteristics is not a guaranteed value, but reference one on design. * The characteristics are of the amplifier itself. 9dB amp. gain G 2 9.2 V V2.78 1.90 1.85 7.0 10.2 12.7 2.63 1.60 1.55 6.0 9.0 2.48 1.30 1.25 5.0 7.8 V CC =4.8V V CC =4.8V Pint, y=4.8V Input level=300mV P–P Input level=300mV P–P Terminal voltage pin (3) AMP frequency characteristics * AMP common mode rejection ratio * Sampling pulse threshold (1) Sampling pulse threshold (2) Blanking pulse high level fC CMR V THB V TH1 V TH2 V CC =4.8V V 3=100mV P–P 10MHz V CC =4.8V V 3=100mV P–P 10MHz V CC =4.8V V CC =4.8V V CC =4.8V V 3=300mV P–P 0.8 0.8 3.5 –3.0 –35 1.5 1.5 2.2 2.2 dB dB V V V n Electrical Characteristics (VCC =4.8V, Ta=25–2˚C) V CC =4.8V Pint, y=4.8V V CC =4.8V Pint, y=4.8V Parameter Symbol Range Operating supply voltage range V CC 4.5V to 5.1V n Recommended Operating Range (Ta=25˚C)

Note) The above characteristics value, measured at VCC =5V, is not a guaranteed value, but reference one on design. Pin No. Pin name Equivalent circuit 1 9dB OUT V CC (4) DC voltage (VCC= 5V) Description BLK SIG.IN SP2 1kΩ H 3.5V Black level: 1.55V 50kΩ 50µA n Pin Descriptions L 0.5V Black level: 2.6V V CC 4.8V H 2.2V L 0.8V SP1 H 2.2V L 0.8V GND 6dB OUT Black level: 1.6V Same as for Pinq. GND (7) 1kΩ 63kΩ 33kΩ V CC (4) 75µA 200Ω 1kΩ 58kΩ 500Ω 38kΩ 300µA 300µA 1kΩ 1kΩ 28kΩ 20kΩ 28kΩ 20kΩ GND (7) V CC (4) GND (7) V CC (4) GND (7) V CC (4) GND (7)

  • 9-dB-amp. output CDS signal
  • Typical 1.55V DC output
  • 90-Ω output impedance
  • Blanking (Hclear) pulse input (from an AN2145 series only)
  • Active high
  • 3.0V threshold voltage
  • 50kΩ input impedance
  • Grounded or left open when not used
  • CCD signal input
  • CCD signal must be input through a capacitor.
  • The capacitor should preferably be 0.022µF.
  • 2.6V typ. bias voltage
  • Sample-hold pulse input
  • Active high
  • 1.5V threshold voltage
  • Sampling pulses are input in syn- chronization with the video timing of CCD signal at Pine.
  • Sample-hold pulse input
  • Active high
  • 1.5V threshold voltage
  • Sampling pulses are input in syn- chronization with the feed-through timing of CCD signal at Pine.
  • Supply voltage
  • Ground
  • 6-dB-amp. output CDS signal