Integrated Circuits: September 2, 1996

Dual charge-pump converter drives 10 mA/output.

Requiring only four electrolytic capacitors, the TCM680 dc/dc converter develops ±10V from a single +5V logic supply or ±6V from a +3V lithium cell. The device draws <½ the supply current of its nearest competitor and drives a maximum load current of 10 mA/output. You can use the TCM680 whenever both positive and negative analog supply voltages are required but only a single low-voltage supply is available. The device's high-differential-output voltage makes it useful for LCD-biasing applications. Offered in eight-pin plastic DIP and SOIC configurations, the TCM680 costs $1.63 (1000) and $1.66 (1000), respectively. Telcom Semiconductor Inc, Mountain View, CA. (415) 968-9241.

Bus terminator IC ends high-speed distortion.

Combining 16 resistor, capacitor, and Schottky diode line-termination circuits in a single SSOP20 package, the RCD16-47B6 eliminates signal distortion in computer and data-communication products that use high-speed parallel buses. When used to terminate a 16-bit bus, the RCD16-47B6 replaces 48 discrete components and 96 solder joints. This action not only increases reliability, but also reduces assembly costs. The bus-terminator IC costs $1.01 (100,000). SGS-Thomson Microelectronics, Lincoln, MA. (617) 259-0300.

Small-outline charge controller is battery-friendly.

Using d²V/dt² and -dV gradient-detection algorithms, the U2407B control IC provides fast, safe charging of NiCd, NiMH, and Li-ion batteries. The device detects overcharging at an early stage, before the reflection point of the voltage curve, which helps maximize battery-service life and capacity. In addition to a 16-pin DIP, the U2407B comes in a space-saving 16-pin SOIC package. Each version costs $1.50 (100,000). Temic Semiconductors, Santa Clara, CA. (800) 554-5565, ext 88.

SCSI circuit breaker replaces diode and fuse.

Housed in an eight-pin SOIC, the UCC3916 circuit breaker provides unidirectional current flow and limiting for 5V SCSI applications. The device, which exceeds the protection levels of diode and fuse combinations, has a 1.65A trip current and an internally programmed maximum current of 2.1A. When the trip level is <1.65A, the internal power MOSFET is switched on at a nominal 220 mV. When output current exceeds the trip level, the fault timer starts, opening the circuit after a delay. The UCC3916 costs $1.90 (1000). Unitrode Corp, Merrimack, NH. (603) 424-2410.

Static RAMs target 16-bit DSP applications.

You can configure two asynchronous 64k×16-bit SRAMs, the 5V MCM6223 and the 3.3V MCM6323, to maximize performance in DSP applications. A third part, the 3.3V 128k×8-bit MCM6326 SRAM, has three-state outputs and serves as a buffer in a number of communications applications. All of the devices offer access times as low as 12 nsec. The MCM6223 and MCM6323 come in 44-lead SOJ packages and cost $25 (1000) and $27.50 (1000), respectively. The MCM6326 is housed in a 32-lead SOJ package and costs $27.50 (1000). Motorola Microprocessor and Memory Technologies Group, Austin, TX. (512) 993-7726.

12-bit ADCs meet imaging needs.

Ranging in speed from 750k samples/ sec to 2M samples/sec, a family of 5- and 3.3V 12-bit ADCs serves high-resolution imaging applications. The XRD8794 and XRD87L94 have tristate parallel outputs and give access to the resistor ladder at three points to correct for nonlinearity in the source signal. The XRD66092 and XRD66L92 offer serial outputs and six reference taps to the resistor network, as well as over/underflow detection. Supplied in 28-pin plastic DIP and SOIC configurations, the converters cost $17.44 (1000). Exar Corp, Fremont, CA. (510) 668-7000.

AGC amplifiers for CDMA/FM cellular networks.

Two AGC amplifiers maintain consistent power levels over changing distances between subscriber handsets and base stations and in the presence of interference caused by multipath fading, terrain topology, and environmental conditions. Designed specifically for dual-mode CDMA/FM cellular applications, the Q5500 Receive and Q5505 Transmit amplifiers provide linear gain control for intermediate frequencies of up to 300 MHz in general-purpose AGC amplifier loops. The devices, which operate from a 3.6V supply and come in 16-pin SSOPs, cost $2.95 (1000). Qualcomm Inc, San Diego, CA. (619) 587-1121.

Instrument amp has >86-dB common-mode rejection.

Used in place of a two- or three-op-amp resistor-network design, the AD622 instrumentation amplifier improves common-mode rejection, linearity, and temperature stability and reduces board space and development costs. The part's common-mode rejection is >86 dB at a gain of 10, and gain error is <0.15% (0.05% typ) at a gain of 1. Nonlinearity is 10 ppm over the gain range of 1 to 100. Gain vs temperature is guaranteed to be <50 ppm/°C. Packaging options include eight-pin DIP and SOIC configurations. Prices start at $2.50. Analog Devices Inc, Canton, MA. (617) 937-1428.

High-performance 400-MHz op amp needs only 50 mW.

With a wide 400-MHz bandwidth, the CLC446 current-feedback op amp delivers a slew rate of 2000 V/µsec and rise and fall times of 900 psec from 50 mW of quiescent power. In addition to operating in high-speed, high-resolution component RGB video systems, the CLC446 can serve as a low-power, high-resolution ADC driver, due to the device's fast 9-nsec settling time (to within 0.1%) and low harmonic distortion. Packaging options include eight-pin DIPs and SOICs. The CLC446 costs $1.95 (1000). Comlinear Corp, Fort Collins, CO. (800) 272-9959.

Dual video filter replaces discrete components.

The single-chip ML-6423 dual video filter not only replaces up to a dozen discrete inductors and capacitors, but also uses a built-in analog adder to eliminate one of the three DACs used in video products. The device contains two lowpass filters, each with a cutoff frequency of 5.5 MHz and sin x/x correction to compensate for amplitude fall-off in the output of the DACs. Each filter channel also has an input buffer amplifier, a sixth-order lowpass filter, a first-order all-pass equalizer, and an output amplifier capable of driving a 75[ohm] load to ground. The part costs $5 (1000) in a 16-pin SOIC. Micro Linear Corp, San Jose, CA. (408) 433-5200.

1-Mbit ROM gets data in 45 nsec.

Aimed at the disk-drive market, the S631024 64k×16-bit mask-programmable ROM reliably stores firmware that it can access in 45 nsec. A second device, the S631001 128k×8-bit ROM, targets high-speed modems with its access times of 45 and 70 nsec. Both the S631024 and S631001 require a single 5V power supply and come in plastic-DIP, PLCC, and TSOP configurations. The 40- and 48-lead TSOP versions are useful for disk drive manufacturers moving from 3.5- to 1.8-in. drives. You can use the devices as drop-in replacements for flash, EPROM, and OTP. In PLCCs, the 45-nsec S631024 costs $5 (10,000); the 45-nsec S631001 costs $3.45 (10,000). American Microsystems Inc, Pocatello, ID. (208) 233-4690.