Document
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SHC
615
SHC615
SHC
615
Wide-Bandwidth, DC RESTORATION CIRCUIT
FEATURES
q PROPAGATION DELAY: 2.2ns q BANDWIDTH: OTA: 750MHz Comparator: 280MHz q LOW INPUT BIAS CURRENT: –0.3µA q SAMPLE/HOLD SWITCHING TRANSIENTS: +1/–7mV q SAMPLE/HOLD FEEDTHROUGH REJECTION: 100dB q CHARGE INJECTION: 40fC q HOLD COMMAND DELAY TIME: 3.8ns q TTL/CMOS HOLD CONTROL
APPLICATIONS
q BROADCAST/HDTV EQUIPMENT q TELECOMMUNICATIONS EQUIPMENT q HIGH-SPEED DATA ACQUISITION q CAD MONITORS/CCD IMAGE PROCESSING q NANO SECOND PULSE INTEGRATOR/ PEAK DETECTORS q PULSE CODE MODULATOR/ DEMODULATOR q COMPLETE VIDEO DC LEVEL RESTORATION q SAMPLE/HOLD AMPLIFIER
DESCRIPTION
The SHC615 is a complete subsystem for very fast and precise DC restoration, offset clamping, and low frequency hum suppression of wideband amplifiers or buffers. Designed to stabilize the performance of video signals, it can also be used as a sample/hold amplifier, high-speed integrator, or peak detector for nanosecond pulses. A wideband Operational Transconductance Amplifier (OTA) with a high-impedance cascode current source output and fast sampling comparator set a new standard for high-speed applications. Both can be used as stand-alone circuits or combined to form a more complex signal processing stage. The self-biased, bipolar OTA can be viewed as an ideal voltage-controlled current source and is
Ground 9 CHOLD 4
optimized for low input bias current. The sampling comparator has two identical high-impedance inputs and a current source output optimized for low output bias current and offset voltage; it can be controlled by a TTL-compatible switching stage within a few nanoseconds. The transconductance of the OTA and sampling comparator can be adjusted by an external resistor, allowing bandwidth, quiescent current, and gain tradeoffs to be optimized. The SHC615 is available in SO-14 surface mount and 14-pin plastic DIPs, and is specified over the extended temperature range of –40°C to +85°C.
Base 3 2 Emitter
Hold Control
7
Switching Stage Sampling Comparator (SC) SOTA ∞ SHC615 13 +VCC
OTA 12 Collector (IOUT) IQ Adjust
S/H 10 In+ S/H 11 In–
Biasing
1
5 –VCC
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111 Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1994 Burr-Brown Corporation
PDS-1214C
Printed in the U.S.A. May, 1995
DC SPECIFICATIONS
At VCC = ±5V, RLOAD = 100Ω, RQ = 300Ω, RIN = 150Ω and TA = +25°C, unless otherwise specified. SHC615AP, AU PARAMETER OTA OFFSET VOLTAGE, VE at VB = 0 Initial vs Temperature vs Supply (tracking) B-INPUT BIAS CURRENT Initial vs Temperature C-OUTPUT BIAS CURRENT, IC at VB = 0 Initial B-INPUT IMPEDANCE INPUT NOISE Voltage Noise Density, B-to-E Voltage Noise Density, B-to-C INPUT VOLTAGE RANGE OUTPUT Output Voltage Compliance C-Current Output E-Current Output C-Output Impedance E-Output Impedance Open-Loop Gain TRANSCONDUCTANCE Small Signal, <200mV fOUT = 100kHz to 100MHz fOUT = 100kHz to 100MHz –200 8 40 55 –0.3 1 –77 4.4 2.2 4.5 ±3.4 ±3.2 ±20 ±20 0.5 12 96 70 ±40 mV µV/°C dB µA nA/°C µA MΩ nV/√Hz nV/√Hz V V mA mA MΩ Ω dB mA/V CONDITIONS MIN TYP MAX UNITS
VCC = ±4.5V to ±5.5V
50
±0.9
+100
±18 ±18
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
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SHC615
2
DC SPECIFICATIONS (CONT)
At VCC = ±5V, RLOAD = 1kΩ, RQ = 300Ω, and TA = +25°C, unless otherwise specified. SHC615AP, AU PARAMETER COMPARATOR INPUT BIAS CURRENT Initial vs Temperature C-OUTPUT BIAS CURRENT Initial vs Temperature INPUT IMPEDANCE Input Impedance INPUT NOISE Voltage Noise Density INPUT VOLTAGE RANGE Input Voltage Range Common-Mode Input Range OUTPUT Output Voltage Compliance C-Current Output C-Output Impedance Open-Loop Gain TRANSCONDUCTANCE Transconductance HOLD CONTROL Logic 1 Voltage Logic 0 Voltage Logic 1 Current Logic 0 Current TRANSFER CHARACTERISTICS Charge Injection Feedthrough Rejection COMPLETE SHC615 POWER SUPPLY Rated Voltage Derated Performance Quiescent Current Quiescent Current Range TEMPERATURE RANGE Operating Storage ±5 ±15 ±3 to ±36 V V mA mA °C °C +2 0 V Hold Control = 5.0V V Hold Control = 0.8V Track-To-Hold Hold Mode 1 0.05 40 –100 fOUT = 100kHz to 100MHz 1.0 –2.3 ±10 ±13 0.2 5 ±3.0 ±3.2 ±3.5 ±3.2 620 || 2 83 22 +VCC +0.6 0.8 ±5 µA nA/°C µA nA/°C MΩ nV/√Hz.