Features: • Programmable Gain
• 4 Independent 2-Quadrant Multiplying 8-Bit DACs with Output Amplifiers
• Dual Positive (+10 V and +5 V) Supplies or Dual (+5 V) Supplies Capability
• High Speed:
12.5 MHz Digital Clock Rate
VREF to VOUT Settling Time: 150ns to 8-bit (typ)
Voltage Reference Input Bandwidth: 15 MHz
• Very Low Noise Gain Control
• Low Power: 80mW
• Low AC Voltage Reference Feedthrough
• Excellent Channel-to-Channel Isolation
• DNL = +0.5 LSB, INL = +1 LSB (typ)
• DACs Matched to +0.5% (typ)
• Low Harmonic Distortion: 0.25% typical with VREF = 1 V p-p @ 1 MHz
• Latch-Up Free
• ESD Protection: 2000 V MinimumApplication• Direct High-Frequency Automatic Gain Control
• Video AGC & CCD Level AGC
• Convergence Adjustment for High-Resolution Monitors (Workstations)
• Multiplier ReplacementPinout
SpecificationsVCC to VREFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+6.5 V
VEE to VREFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V
VCC to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +13.0 V
VEE to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V
VREF 1-4 to DGND, VREFN . . . . . . . . . . . . . . . . . . . VCC to VEE
VOUT 1-4 to DGND, VREFN . . . . . . . . . . . . . . . . . . .VCC to VEE
Digital Input & Output Voltage to DGND 0.5 to VDD +0.5 V
Operating Temperature Range
Extended Industrial . . . . . . . . . . . . . . . . 40°C to +85°C
Maximum Junction Temperature . . . . . . ..65°C to 150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . .+300°C
Package Power Dissipation Rating @ 75°C
PDIP, SOIC, PLCC . . . . . . . . . . . . . . . . . . . . . . . . . .1050mW
Derates above 75°C . . . . . . . . . . . . . . . . . . . . . .14mW/°C
NOTES:
1 Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation at or above this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
2 Any input pin which can see a value outside the absolute maximum ratings should be protected by Schottky diode clamps (HP5082-2835) from input pin to the supplies. All inputs have protection diodes which will protect the device from short transients outside the supplies of less than 100mA for less than 100ms.
DescriptionThe MP7643 is ideal for digital gain control of high frequency analog signals such as video, composite video and CCD. The MP7643 includes 4-channels of high speed, wide bandwidth, two quadrant multiplying, 8-bit accurate digital-to-analog converter. MP7643 includes an output drive buffer per channel capable of driving a +1mA (typ) load. DNL of better than +0.5 LSB is achieved with a channel-to-channel matching of typically 0.5%. Stability, matching, and precision of the DACs are achieved by using MPS' thin film technology. Excellent channel-to-channel isolation is also achieved with MPS' BiCMOS process which cannot be achieved using a typical CMOS technology.
An open loop architecture (patent pending)MP7643 provides wide small signal bandwidth from VREF to output up to 15 MHz (typ), fast output settling time of 150 ns, and excellent VREF feedthrough isolation. The negative feedback terminal of the output op amp is available for user gain control. In addition, low distortion in the order of 0.25% with a 1 V p-p, 1 MHz signal is achieved.
The combination of a constant input Z and the ability to vary VREFN within VCC 1.8 V to VEE +1.5 V allows flexibility for optimum system design.
The MP7643 is fabricated on a junction isolated, high speed BiCMOS (BiCMOS IVTM) process with thin film resistors. This process enables precision high speed analog/digital (mixedmode) circuits to be fabricated on the same chip.
MP7643 Data Sheet
