技術(shù)規(guī)格

詳細(xì)描述

THAT5173 是用于低噪聲、模擬、差分、電流反饋音頻前置放大器（例如 THAT 1570 和 1583）的數(shù)字增益控制器。當(dāng)與適當(dāng)?shù)哪M增益模塊結(jié)合使用時(shí)，5173 支持從 0dB 到 60dB 的數(shù)字控制增益以 3dB 為步長(zhǎng)，同時(shí)保持低噪聲和失真。它在 + 5V 至 + 17V 模擬電源范圍內(nèi)工作，支持高達(dá)+27 dBu 的輸入信號(hào)電平（在0dB 增益和 + 17V 電源下）與沒有輸入焊盤的1570/1583 結(jié)合使用。5173 包括一個(gè)差分伺服和過零檢測(cè)器，以在增益調(diào)整期間限度地減少直流偏移和毛刺（拉鏈噪聲）。

5173 通過工業(yè)標(biāo)準(zhǔn)串行外設(shè)接口 (SPI) 端口進(jìn)行控制。通過該接口可以控制四個(gè)通用輸出 (GPO)。GPO 可用于控制輔助功能，例如輸入選擇器、濾波器、、LED、繼電器等。

5173 旨在與 THAT 1570 或 1583 差分音頻前置放大器 IC 搭配。1570/5173 或 1583/5173 組合一起為數(shù)字可控音頻前置放大器應(yīng)用提供高性能解決方案。然而，5173 也可用于控制離散前置放大器。

The THAT5173 is a digital gain controller for low-noise, analog, differential, current-feedback audio preamplifiers such as the THAT 1570 and 1583. When used in conjunction with an appropriate analog gain block, the 5173 supports digitally control gain from 0dB to 60dB in 3dB steps, while preserving low noise and distortion. It operates from +5V to +17V analog supplies, supporting input signal levels as high as +27 dBu (at 0dB gain and +17V supplies) in combination with the 1570/1583 without an input pad. The 5173 includes a differential servo and zero-crossing detector to minimize dc offsets and glitches (zipper noise) during gain adjustments.

The 5173 is controlled via an industry standard serial-peripheral interface (SPI) port. Four General Purpose Outputs (GPOs) can be controlled via this interface. The GPOs may be used to control auxillary functions such as input selectors, filters, mutes, LEDs, relays, etc.

The 5173 was designed to mate perfectly with the THAT 1570 or 1583 Differential Audio Preamplifier ICs. Together, the 1570/5173 or 1583/5173 combination provides a high performance solution for digitally-controllable audio preamplifier applications. However, the 5173 may also be used to control a discrete preamplifier.