Low-power video buffer unlocks extra battery life for mobile video products

ST Microelectronics introduced new video buffer IC TSH122, which combines features like low operating current and low standby power for longer recharge intervals in portable consumer devices. Mobile video devices including digital cameras, camera phones and personal media players can run longer using the new TSH122 video buffer IC.
The TSH122 is a single-channel CVBS (Composite Video Baseband Signal) video buffer/filter with 6dB internal gain, optimized for DC or AC coupling to a 75-Ohm cable. The input can be directly connected to the video DAC, to drive composite video to an external device such as a TV display.

Some of the features are:

1. Low operating current of 1.7mA
2. Low standby current of just 4nA typical (500nA maximum).
3. Operates from a single supply of 2.2Vto 5V
4. Has a 6th-order reconstruction filter for attenuation of DAC sampling aliases.
5. The internal gain-setting resistors reduce component count and footprint.
6. SAG correction is also implemented at the output, allowing the use of a smaller coupling capacitor.
7. Video-performance highlights for the TSH122 include differential gain of 0.5%, differential phase of 0.5 degrees, and low group delay of 10ns.
8. Attenuation at 27MHz is typically better than -36dB, and the amplifier achieves gain flatness beyond 5.4MHz.
9. Rail-to-rail output capability also maximizes dynamic range for low-voltage operation.

Package: SC70-6 (SOT323-6) package
Size: 2.2 x 2.4 mm
Availability: The TSH122 is in full production. Samples are also available.
Pricing: $0.5 for 1000 units.

Further information on ST can be found at: www.st.com