VCA2615 Datenblatt PDF ( Pinout, schematic )

Teilenummer : VCA2615

Function : Dual/ VARIABLE GAIN AMPLIFIER with Low-Noise Preamp

Hersteller : Texas Instruments

Pinout :

VCA2615 datenblatt

Beschreibung :

The VCA2615 is a dual-channel, variable gain amplifier consisting of a Low-Noise Preamplifier (LNP) and a Variable Gain Amplifier (VGA). This combination along with the device features makes it well-suited for a variety of ultrasound systems.

The LNP offers a high level of flexibility to adapt to a wide range of systems and probes. The LNP gain can be programmed to one of four settings (3dB, 12dB, 18dB, 22dB), while maintaining excellent noise and signal handling characteristics. The input impedance of the LNP can be controlled by selecting one of the built-in feedback resistors.

This active termination allows the user to closely match the LNP to a given source impedance, resulting in optimized overall system noise performance. The differential LNP
outputs are provided either as buffered outputs for further CW processing, or fed directly into the variable-gain amplifier (VGA). Alternatively, an external signal can be applied to the
differential VGA inputs through a programmable switch.

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VCA2615 pdf

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DAC8805 Datenblatt PDF ( Pinout, schematic )

Teilenummer : DAC8805

Function : 14-Bit, Dual, Parallel Input, Multiplying Digital-to-Analog Converter

Hersteller : Burr-Brown -> Texas Instruments

Pinout :

DAC8805 datenblatt

Beschreibung :

The DAC8805 dual, multiplying digital-to-analog converter (DAC) is designed to operate from a single 2.7V to 5.5V supply. The applied external reference input voltage VREF determines the full-scale output current. An internal feedback resistor (RFB) provides temperature tracking for the full-scale output when combined with an external, current-to-voltage (I/V) precision amplifier.
A RSTSEL pin allows system reset assertion (RS) to force all registers to zero code when RSTSEL = ‚0‘, or to mid-scale code when RSTSEL = ‚1‘. Additionally, an internal power-on reset forces all registers to zero or mid-scale code at power-up, depending on the state of the RSTSEL pin. A parallel interface offers high-speed communications. The DAC8805 is packaged in a space-saving TSSOP-38 package and has an industry-standard pinout. The device is specified from –40°C to +125°C. For a 16-bit, pin-compatible version, see the

• ±0.5LSB DNL
• ±0.5LSB INL
• Low Noise: 12nV/√Hz
• Low Power: IDD = 1µA per channel at 2.7V
• 2mA Full-Scale Current, with VREF= 10V
• Settling Time: 0.5µs
• 14-Bit Monotonic
• 4-Quadrant Multiplying Reference Inputs
• Reference Bandwidth: 10MHz
• Reference Input: ±18V
• Reference Dynamics: –105 THD
• Midscale or Zero Scale Reset
• Analog Power Supply: +2.7V to +5.5V
• TSSOP-38 Package
• Industry-Standard Pin Configuration
• Pin Compatible with the 16-Bit DAC8822
• Temperature Range: –40°C to +125°C

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DAC8805 pdf

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