VCA2614 VCA 261 4 SBOS185D – JANUARY 2001 – REVISED MARCH 2003 Dual, VARIABLE GAIN AMPLIFIER with Input Buffer FEATURES DESCRIPTION ● ● ● ● ● ● The VCA2614 is a highly integrated, dual receive channel, Variable Gain Amplifier (VGA) with analog gain control. GAIN RANGE: 40dB 40MHz BANDWIDTH LOW CROSSTALK: 70dB at Max Gain, 5MHz HIGH-SPEED VARIABLE GAIN ADJUST POWER SHUTDOWN MODE HIGH IMPEDANCE INPUT BUFFER The VCA2614’s VGA section consists of two parts: the Voltage Controlled Attenuator (VCA) and the Programmable Gain Amplifier (PGA). The gain and gain range of the PGA can be digitally programmed. The combination of these two programmable elements results in a variable gain ranging from 0dB up to a maximum gain as defined by the user through external connections. The single-ended unity gain input buffer provides predictable high input impedance. The output of the VGA can be used in either a single-ended or differential mode to drive high-performance Analog-to-Digital Converters (ADCs). A separate power-down pin reduces power consumption. APPLICATIONS ● ● ● ● ULTRASOUND SYSTEMS GAMMA CAMERAS WIRELESS RECEIVERS TEST EQUIPMENT CP2A The VCA2614 also features low crosstalk and outstanding distortion performance. The combination of low noise and gain range programmability makes the VCA2614 a versatile building block in a number of applications where noise performance is critical. The VCA2614 is available in a TQFP-32 package. CP1A VCA2614 (1 of 2 Channels) NOUTA INA Buffer Voltage Control Attenuator Programmable Gain Amplifier POUTA MGS1 Analog Control VCACNTL Maximum Gain Select MGS2 MGS3 Maximum Gain Select NOUTB INB Buffer Voltage Control Attenuator Programmable Gain Amplifier POUTB CP2B CP1B Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright © 2001-2003, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. www.ti.com ELECTROSTATIC DISCHARGE SENSITIVITY ABSOLUTE MAXIMUM RATINGS(1) Power Supply (+VS) ............................................................................. +6V Analog Input ............................................................. –0.3V to (+VS + 0.3V) Logic Input ............................................................... –0.3V to (+VS + 0.3V) Case Temperature ......................................................................... +100°C Junction Temperature .................................................................... +150°C Storage Temperature ...................................................... –40°C to +150°C This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. Exposure to absolute maximum conditions for extended periods may affect device reliability. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. PACKAGE/ORDERING INFORMATION SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER TRANSPORT MEDIA, QUANTITY VCA2614Y/250 VCA2614Y/2K Tape and Reel, 250 Tape and Reel, 2000 PRODUCT PACKAGE-LEAD PACKAGE DESIGNATOR(1) VCA2614Y TQFP-32 Surface-Mount PBS –40°C to +85°C VCA2614Y " " " " " NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com. ELECTRICAL CHARACTERISTICS At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground differential output (2Vp-p), MGS = 011, and fIN = 5MHz, unless otherwise noted. VCA2614Y PARAMETER BUFFER Input Resistance Input Capacitance Input Bias Current Maximum Input Voltage Input Voltage Noise Input Current Noise Noise Figure Bandwidth CONDITIONS MIN MGS = 111, PGA Gain = 44.2dB, RS = 50Ω Independent of Gain RF = 550Ω, PGA Gain = 44.2dB, RS = 75Ω PROGRAMMABLE VARIABLE GAIN AMPLIFIER Peak Input Voltage –3dB Bandwidth Slew Rate Output Signal Range RL ≥ 500Ω Each Side to Ground Output Impedance f = 5MHz Output Short-Circuit Current 3rd-Harmonic Distortion f = 5MHz, VOUT = 2Vp-p, VCACNTL = 3.0V 2nd-Harmonic Distortion f = 5MHz, VOUT = 2Vp-p, VCACNTL = 3.0V Overload Performance (2nd-Harmonic Input Signal = 1Vp-p, MGS = 111, VCACNTL = 2V Distortion) Time Delay IMD, 2-Tone VOUT = 2Vp-p, f = 9.95MHz Crosstalk Group Delay Variation 1MHz < f < 10MHz, Full Gain Range –45 –45 ACCURACY Gain Slope Gain Error Output Offset Voltage GAIN CONTROL INTERFACE Input Voltage (VCACNTL) Range Input Resistance Response Time POWER SUPPLY Specified Operating Range Power Dissipation Power-Down TYP MAX 600 5 1 1 4.8 350 13 100 kΩ pF nA Vp-p nV/ √Hz fA/ √Hz 1 40 300 2.5 ±1 1 ±40 –60 –50 –40 to –45 Vp-p MHz V/µs V Ω mA dBc dBc dB 5 –59 70 13 ns dBc dB ns dB MHz 10.5 ±50 dB/V dB mV 0.2 to 3.0 1 0.2 V MΩ µs ±2(1) 40dB Gain Change, MGS = 111 4.75 Operating, Each Channel UNITS 5.0 120 9.2 5.25 150 V mW mW NOTE: (1) Referenced to best fit dB-linear curve. 2 VCA2614 www.ti.com SBOS185D PIN CONFIGURATION NC DNC CP2A CP1A VDDA GNDA POUTA NOUTA 31 30 29 28 27 26 25 TQFP 32 Top View +INA 1 24 VCACNTL NC 2 23 MGS3 VDDR 3 22 MGS2 VBIAS 4 21 MGS1 VCM 5 20 PD GNDR 6 19 NC NC 7 18 NC +INB 8 17 DNC 16 NOUTB 13 VDDB 15 12 CP1B POUTB 11 CP2B 14 10 DNC GNDB 9 NC VCA2614 PIN DESCRIPTIONS PIN DESIGNATOR 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 +INA NC VDDR VBIAS VCM GNDR NC +INB NC DNC CP2B CP1B VDDB GNDB POUTB NOUTB DESCRIPTION PIN DESIGNATOR Input Channel A No Internal Connection Internal Reference Supply Bias Voltage Common-Mode Voltage Internal Reference Ground No Internal Connection Input Channel B No Internal Connection Do Not Connect Coupling Capacitor Channel B Coupling Capacitor Channel B +5V Supply Channel B Ground Channel B Positive Output Channel B Negative Output Channel B 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 DNC NC NC PD MGS1 MGS2 MGS3 VCACNTL NOUTA POUTA GNDA VDDA CP1A CP2A DNC NC VCA2614 SBOS185D www.ti.com DESCRIPTION Do Not Connect No Internal Connection No Internal Connection Power Down (Active LOW) Maximum Gain Select 1 (MSB) Maximum Gain Select 2 Maximum Gain Select 3 (LSB) VCA Analog Control Negative VCA Output Channel A Positive VCA Output Channel A Ground Channel A +5V Supply Channel A Coupling Capacitor Channel A Coupling Capacitor Channel A Do Not Connect No Internal Connection 3 TYPICAL CHARACTERISTICS At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2Vp-p) MGS = 011, and fIN = 5MHz, unless otherwise noted. GAIN vs VCACNTL GAIN ERROR vs TEMPERATURE 50 MGS = 111 45 20 MGS = 001 15 Gain Error (dB) Gain (dB) 25 0.5 0 –0.5 +85°C –1.0 MGS = 010 10 0 +25°C 1.0 MGS = 101 30 5 –40°C 1.5 MGS = 110 40 35 2.0 MGS = 011 –1.5 MGS = 100 –2.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 VCACNTL (V) VCACNTL (V) GAIN ERROR vs VCACNTL GAIN ERROR vs VCACNTL 2.0 2.0 1.5 1.5 5MHz MGS = 001 1.0 10MHz 0.5 0 1MHz –0.5 Gain Error (dB) Gain Error (dB) 1.0 MGS = 000 0.5 0 –0.5 –1.0 –1.0 –1.5 –1.5 –2.0 MGS = 111 –2.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 VCACNTL (V) VCACNTL (V) GAIN MATCH: CHA to CHB, VCACNTL = 0.2V GAIN MATCH: CHA to CHB, VCACNTL = 3.0V 120 80 70 100 60 50 Units Units 80 60 40 30 40 20 20 10 4 –0.07 –0.06 –0.05 –0.04 –0.02 –0.01 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.08 0.10 0.11 0.12 0.13 0.14 0.16 0.17 0.18 0 –0.88 –0.81 –0.74 –0.68 –0.61 –0.55 –0.48 –0.42 –0.35 –0.29 –0.22 –0.16 –0.09 –0.03 0.04 0.10 0.17 0.23 0.30 0.36 0.43 0.49 0 Delta Gain (dB) Delta Gain (dB) VCA2614 www.ti.com SBOS185D TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2Vp-p) MGS = 011, and fIN = 5MHz, unless otherwise noted. GAIN vs FREQUENCY (VCACNTL = 3.0V) 50 45 VCACNTL = 3.0V 30 40 25 MGS = 011 35 20 30 15 Gain (dB) Gain (dB) GAIN vs FREQUENCY 35 MGS = 111 25 20 15 VCACNTL = 1.6V 10 5 0 MGS = 001 10 VCACNTL = 0.2V –5 5 –10 0 100k 1M 10M –15 100k 100M Frequency (Hz) 10M INPUT REFERRED NOISE vs VCACNTL OUTPUT REFERRED NOISE vs VCACNTL 220 RS= 50Ω 400 100M Frequency (Hz) 450 RS= 50Ω 200 MGS = 111 180 350 160 Noise (nV/√Hz) Noise (nV/√Hz) 1M 300 250 200 MGS = 011 150 140 MGS = 111 120 100 80 60 100 MGS = 011 40 50 20 0 0 0 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 0 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 VCACNTL (V) VCACNTL (V) NOISE FIGURE vs RS INPUT REFERRED NOISE vs RS 100 24 22 Noise Figure (dB) Noise (nV√Hz) 20 10 18 16 14 12 10 8 6 4 2 1 1 10 100 10 1k RS (Ω) VCA2614 SBOS185D 100 1k RS (Ω) www.ti.com 5 TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2Vp-p) MGS = 011, and fIN = 5MHz, unless otherwise noted. HARMONIC DISTORTION vs FREQUENCY (Differential, 2Vp-p, MGS = 001) NOISE FIGURE vs VCACNTL 55 –30 50 –35 Harmonic Distortion (dBc) Noise Figure (dB) 45 40 35 30 25 20 15 10 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 –55 –60 –65 10M HARMONIC DISTORTION vs FREQUENCY (Differential, 2Vp-p, MGS = 011) HARMONIC DISTORTION vs FREQUENCY (Differential, 2Vp-p, MGS = 111) –30 –35 VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 –40 –45 –50 –55 –60 –65 –70 –75 1M –80 100k 10M VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 1M 10M Frequency (Hz) Frequency (MHz) HARMONIC DISTORTION vs FREQUENCY (Single-Ended, 1Vp-p, MGS = 001) HARMONIC DISTORTION vs FREQUENCY (Single-Ended, 1Vp-p, MGS = 011) –30 –35 –30 –35 –40 –45 –50 –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 100k 1M Frequency (Hz) Harmonic Distortion (dBc) –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 100k VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 VCACNTL (V) Harmonic Distortion (dBc) Harmonic Distortion (dBc) –50 –75 100k 0 Harmonic Distortion (dBc) –45 –70 5 VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 1M 10M Frequency (Hz) 6 –40 –55 –60 –65 –70 –75 –80 –85 –90 100k VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 1M 10M Frequency (Hz) VCA2614 www.ti.com SBOS185D TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2Vp-p) MGS = 011, and fIN = 5MHz, unless otherwise noted. HARMONIC DISTORTION vs VCACNTL (Differential, 2Vp-p, 5MHz) HARMONIC DISTORTION vs FREQUENCY (Single-Ended, 1Vp-p, MGS = 111) –55 –60 –65 –70 –75 –80 –85 VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 –90 100k Harmonic Distortion (dBc) Harmonic Distortion (dBc) –40 –45 –50 1M 0 –5 –10 –15 –20 –25 –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 –80 MGS = 001, H2 MGS = 011, H2 MGS = 111, H2 MGS = 001, H3 MGS = 011, H3 MGS = 111, H3 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 10M Frequency (Hz) VCACNTL (V) HARMONIC DISTORTION vs VCACNTL (Single-Ended, 1Vp-p, 5MHz) INTERMODULATION DISTORTION (Single-Ended, 1Vp-p, f = 10MHz, VCACNTRL = 3.0V) 0 0 –5 –10 –15 –20 –25 –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 MGS = 001, H2 MGS = 011, H2 MGS = 111, H2 MGS = 001, H3 MGS = 011, H3 MGS = 111, H3 –10 –20 Amplitude (dB) Harmonic Distortion (dBc) –30 –35 –30 –40 –50 –60 –70 –80 –90 –100 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 10 9.6 10.2 INTERMODULATION DISTORTION (Differential, 2Vp-p, f = 10MHz, VCACNTL = 3.0V) CROSSTALK vs FREQUENCY (Differential, 2Vp-p, MGS = 011) 10.4 0 –10 –10 –20 –20 Cross Talk (dB) Amplitude (dB) 10 Frequency (MHz) 0 –30 –40 –50 –60 –40 –50 –60 –70 –80 –80 –90 VCACNTRL = 0V –30 –70 VCACNTRL = 1.5V VCACNTRL = 3.0V –90 9.6 9.8 10 10.2 10.4 1 Frequency (MHz) 10 100 Frequency (MHz) VCA2614 SBOS185D 9.8 VCACNTL (V) www.ti.com 7 TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VDD = 5V, load resistance = 500Ω on each output to ground, differential output (2Vp-p) MGS = 011, and fIN = 5MHz, unless otherwise noted. OVERLOAD DISTORTION vs FREQUENCY 0.5V 0.1 1V 0.25V –10 50 48 –20 ICC (mA) 2nd-Harmonic Distortion (dBc) ICC vs TEMPERATURE 52 0 –30 46 –40 44 –50 42 40 –60 1 –40 100 –25 –10 5 20 35 50 65 80 95 Temperature (°C) Frequency (Hz) Group Delay (ns) GROUP DELAY vs FREQUENCY 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 VCACNTL = 3.0V VCACNTL = 0.2V 1 10 100 Frequency (MHz) 8 VCA2614 www.ti.com SBOS185D OVERVIEW power-on time of the VCA2614 would be increased. If a decrease in the power-on time is needed, the value can be decreased to no less than 100pF. The VCA2614 is a dual-channel, VGA consisting of three primary blocks: an Input Buffer, a VCA, and a PGA (as shown in Figure 1). All stages are AC-coupled with the coupling into the PGA stage being made variable by placing an external capacitor between the CP1 and CP2 pins. This will be discussed further in the PGA section. By using the internal coupling into the PGA, the result is a high-pass filter characteristic with cutoff at approximately 75kHz. The output PGA naturally rolls off at around 40MHz, making the usable bandwidth of the VCA2614 between 75kHz and 40MHz. Channel A Input Buffer VCA Analog Control VCA Control Channel B Input Buffer VCA PGA Channel A Output Maximum Gain Select MGS PGA Channel B Output VOLTAGE-CONTROLLED ATTENUATOR The magnitude of the VCA input signal from the input buffer is reduced by a programmable attenuation factor, set by the analog VCA Control Voltage (VCACNTL) at pin 24. The maximum attenuation is programmable by using the three MGS bits (pins 21, 22, and 23). Figure 2 illustrates this dual-adjust characteristic. The MGS bits adjust the overall range of attenuation and maximum gain while the VCACNTL voltage adjusts the actual attenuation factor. At any given maximum gain setting, the analog variable gain characteristic is linear in dB as a function of the control voltage, and is created as a piecewise approximation of an ideal dB-linear transfer function, see Figure 4. The VCA control circuitry is common to both channels of the VCA2614. The range for the VCACNTL input spans from 0V to 3V. Although overdriving the VCACNTL input above the recommended 3V maximum will not damage the part, this condition should be avoided. VCA Attenuation (dB) 0 FIGURE 1. Simplified Block Diagram of the VCA2614. INPUT BUFFER The input buffer is a unity gain amplifier (gain of +1) with a bandwidth of 100MHz with an input resistance of approximately 600kΩ. The input buffer isolates the circuit driving the VCA2614 inputs from the internal VCA block, which would present a varying impedance to the input circuitry. To allow symmetrical operation of the input buffer, the input to the buffer must be AC-coupled through an external capacitor. The recommended value of the capacitor is 0.01µF. It should be noted that if the capacitor value were increased, the Minimum Attenuation –24.1 Maximum Attenuation –40 0 3.0V Control Voltage FIGURE 2. Swept Attenuator Characteristic. RS OUTPUT INPUT Q1A Q1B Q2A Q2B Q3A Q3B Q4A Q4B Q5A Q5B VCM A1 A2 A3 A4 A5 B1 B2 PROGRAMMABLE ATTENUATOR SECTION FIGURE 3. Programmable Attenuator Section. VCA2614 SBOS185D www.ti.com 9 Attenuator Input A1 to A10 Attenuator Stages RS QS Q1 Q2 Q3 Q4 Q5 Attenuator Output Q6 Q7 Q8 Q9 Q10 VCM A1 A2 A3 C1 A4 C2 V1 A5 C3 V2 V3 A6 C4 V4 A8 C6 V5 Control Input A7 C5 A9 C7 V6 A10 C8 V7 C9 V8 C10 V9 V10 C1 to C10 Clipping Amplifiers 0dB –4.4dB Attenuation Characteristic of Individual FETs VCM – VT 0 V1 V2 V3 V4 V5 V6 V7 V8 V9 V10 Characteristic of Attenuator Control Stage Output OVERALL CONTROL CHARACTERISTICS OF ATTENUATOR 0dB –44dB 0.3V Control Signal 3V FIGURE 4. Piecewise Approximation to Logarithmic Control Characteristics. 10 VCA2614 www.ti.com SBOS185D PGA POST-AMPLIFIER MGS SETTING Figure 5 shows a simplified circuit diagram of the PGA block. As stated before, the input to the PGA is AC-coupled by an internal capacitor. Provisions are made so that an external capacitor can be placed in parallel with the internal capacitor, thus lowering the usable low-frequency bandwidth. The lowfrequency bandwidth is set by the following equation: ( 1 2 • π • 500kΩ • (220pF + CEXTERNAL ) ) ATTENUATOR GAIN VCACNTL = 0.02V to 3V ATTENUATOR + DIFFERENTIAL PGA GAIN 000 Not Valid Not Valid 001 –24.1dB to 0dB 2.6dB to 26.7dB 010 –26.9dB to 0dB 2.6dB to 29.5dB 011 –29.5dB to 0dB 3.0dB to 35.6dB 100 –32.4dB to 0dB 3.1dB to 35.5dB 101 –34.8dB to 0dB 3.4dB to 38.3dB 110 –37.3dB to 0dB 3.7dB to 44.1dB 111 –40.0dB to 0dB 4.1dB to 44.2dB TABLE I. MGS Settings. where CEXTERNAL is the external capacitor value in picofarads. Care should be taken to avoid using too large a value of capacitor, as this can increase the power-on delay time. input buffer noise dominates; at maximum VCA attenuation (large input signals), the PGA noise dominates. Note that if the PGA output is used single-ended, the apparent gain will be 6dB lower. As described previously, the PGA gain is programmed with the same MGS bits that control the VCA maximum attenuation factor. Specifically, the maximum PGA gain at each MGS setting is the inverse (reciprocal) of the maximum VCA attenuation at that setting. Therefore, the VCA + PGA overall gain will always be 0dB (unity) when the analog VCACNTL input is set to 0V (the maximum attenuation for VCA). For VCACNTL = 3V (no attenuation), the VCA + PGA gain will be controlled by the programmed PGA gain. For clarity, the gain and attenuation factors are detailed in Table I. LAYOUT CONSIDERATIONS The VCA2614 is an analog amplifier capable of high gain. When working on a PCB layout for the VCA2614, it is recommended to utilize a solid ground plane that is connected to analog ground. This helps to maximize the noise performance of the VCA2614. Adequate power-supply decoupling must be used in order to achieve the best possible performance. Decoupling capacitors on the VCACNTL voltage should also be used to help minimize noise. Recommended values can be obtained from the layout diagram of Figure 6. The PGA architecture converts the single-ended signal from the VCA into a differential signal. Low input noise was also a requirement of the PGA design due to the large amount of signal attenuation that can be asserted before the PGA. At minimum VCA attenuation (used for small input signals), the VDD To Bias Circuitry Q1 RL VCAOUTP Q11 Q12 Q3 VCM Q9 RL VCAOUTN Q8 RS1 VCM Q13 RS2 +In Q4 Q7 Q14 Q2 Q5 –In Q10 Q6 To Bias Circuitry FIGURE 5. Simplified Block Diagram of the PGA Section with the VCA2614. VCA2614 SBOS185D www.ti.com 11 +5V 0.1µF 1µF +5V 0.01µF INA 0.1µF 0.1µF 1µF 1µF 3 28 1 INA 5 VDDA VDDR VCM 0.01µF NOUTA POUTA 25 26 NOUTA 0.01µF POUTA VCA2614 NOUTB 0.01µF INB 8 INB POUTB VDDB 16 15 0.01µF NOUTB 0.01µF POUTB VBIAS VCNTL 13 4 24 1µF 0.1µF 0.1µF +5V 1µF 0.1µF VCACNTL FIGURE 6. VCA2614 Layout. 12 VCA2614 www.ti.com SBOS185D PACKAGE DRAWING PBS (S-PQFP-G32) PLASTIC QUAD FLATPACK 0,23 0,17 0,50 24 0,08 M 17 25 16 32 9 0,13 NOM 1 8 3,50 TYP Gage Plane 5,05 SQ 4,95 0,25 7,10 SQ 6,90 0,10 MIN 0°– 7° 0,70 0,40 1,05 0,95 Seating Plane 0,08 1,20 MAX 4087735/A 11/95 NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. VCA2614 SBOS185D www.ti.com 13 PACKAGE OPTION ADDENDUM www.ti.com 9-Dec-2004 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty VCA2614Y/250 ACTIVE TQFP PBS 32 250 None CU SNPB Level-3-220C-168 HR VCA2614Y/2K ACTIVE TQFP PBS 32 2000 None CU SNPB Level-3-220C-168 HR Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. None: Not yet available Lead (Pb-Free). Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens, including bromine (Br) or antimony (Sb) above 0.1% of total product weight. (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder temperature. 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