MX029 Datasheet | CML

Features Dual Digitally Controlled Amplifier PRELIMINARY INFORMATION Applications Cellular and LMR Radios PABX’s, Electronic Mail, TAM's Automatic Test Equipment Remote Gain Adjustments Digitally Set Audio Control Levels 2 Digitally Controlled Amplifiers ±48d B Gain/Attenuation in 2d B Steps + Mute Individual Control with a 14-Bit Serial Word Separate Fixed Gain Buffer Amplifier SERIAL CLOCK DATA INPUT LOAD/LATCH SERIAL INTERFACE STAGE 1 CONTROL REGISTER VSS BIAS VSS BIAS CH1, INPUT 1 CH1, INPUT 2 CH1, INPUT 3 TO STAGE 1 CONTROL REGISTER CH1, OUTPUT 1 ∆G CH1, OUTPUT 2 BIAS STAGE 1 CONTROL REGISTER VSS CH2, INPUT 1 BIAS ∆G CH2, INPUT 2 CH2, OUTPUT 1 UNIVERSAL AMP IN UNIVERSAL AMP OUT BIAS The MX029 Digitally Controlled Amplifier Array replaces audio level controls in radio and wireline munications applications. It is a single-chip LSI circuit prised of two discrete, digitally controlled gain sections. Each section has 48 distinct gain steps (+/-48d B of range in 2d B steps) plus MUTE. As shown in Figure 1, both gain stages have switchable inputs. This switching allows for selection of three different input signals on one channel and two on the other channel. One of the channels also has output switching. In addition to two digitally controlled gain stages, there is a general purpose inverting amplifier. The gain of this amplifier is controlled externally via negative feedback. Control of each gain control section is acplished through the serial interface. All switching is acplished using controlled rise and fall times, thereby assuring no transients (clicks or pops). The MX029 requires a single 5-volt supply and is available in the following packages: 16-pin SOIC (MX029DW), 16-pin CDIP (MX029J), and 24-pin TSSOP (MX029TN). 1998 MX-, INC. .mx. Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480096.008 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA. All trademarks and service marks are held by their...