DATASHEET Intermediate Frequency Digital Variable Gain Amplifier GENERAL DESCRIPTION FEATURES The IDTF1200 is a Digitally Controlled Intermediate Frequency Differential Variable Gain Amplifier for BaseStation and other commercial applications with a low IF frequency. The device offers extremely low Noise Figure over the entire gain control range. The device is packaged in compact 5x5 Thin QFNs with 200 ohm differential input and output impedances for ease of integration into the receiver lineup. Versions covering IF frequencies up to 300 MHz with low distortion are available. Ideal for high SNR systems 22 dB typ Maximum Gain 23 dB gain control range 7 bit parallel control 0.25 dB Gain Steps Excellent Noise Figure < 3.0 dB 5mm x 5mm 28 pin package 200 Ω Differential Input 200 Ω Differential Output NF degrades < 2dB @ 12dB reduced gain 50 MHz – 160 MHz frequency range Ultra-Linear: IP3O +48 dBm typical External current setting resistor Fast Gain Step Settling < 20 nsec COMPETITIVE ADVANTAGE The F1200 acts to enhance system SNR when VGA gain is reduced. The F1200 noise figure (NF) degrades only slightly (NF slope ~ -0.16 dB/dB) over a 13 dB control range while holding the Output IP3 approximately constant. The resultant improvement in noise can enhance the system SNR up to 2 decibels at low gain settings relative to a standard VGA. DEVICE BLOCK DIAGRAM The device has excellent DNL and INL simplifying digital compensation. The device also offers the extremely low Harmonic, IM2, and IM3 distortion necessary to drive an ADC directly in an IF sub-sampling application. ` ATTN Out AMP In AMP out ATTN In 7 Gain Control Bias Control Decode Logic VCC VMODE PART# MATRIX ` IF freq range NF F1200 22 to -1 48 50 - 160 2.6 F1206* 20 to -11 47 150 - 250 3.6 F1207* 20 to -11 46 230 - 300 3.7 ORDERING INFORMATION STBY rie IP3O ISET Omit IDT prefix 0.75 mm height Tape & Reel package op Gain Range IDTF1200NBGI8 Pr Part# VCC y BaseStation Diversity Receivers Digital Pre-Distortion Wave Point-to-Point Radios Public Safety Receivers tar APPLICATIONS IDTF1200 RF product Line Industrial Temp range RevO ID T *Future Product Green Page 1 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 ABSOLUTE MAXIMUM RATINGS VCC to GND All other Pins to GND ISET to GND RF Input Power (ATTN_IN+, ATTN_IN-) @GMAX Continuous Power Dissipation θJA (Junction – Ambient) θJC (Junction – Case) The Case is defined as the exposed paddle Operating Temperature Range (Case Temperature) Maximum Junction Temperature Storage Temperature Range Lead Temperature (soldering, 10s) . -0.3V to +5.5V -0.3V to (VCC +0.25V) -0.3V to +2.2V +10 dBm 1.5W +41°C/W +4°C/W TC = -40°C to +85°C 150°C -65°C to +150°C +260°C KEY FEATURE – NOISE FIGURE SLOPE Standard Variable Gain amplifiers exhibit a [NF/Gain] slope of -1 dB/dB. Practically speaking, as gain is reduced, Noise Figure degrades dB for dB. The F1200 utilizes new technology that flattens the Noise Figure response (~ -0.16 dB/dB) for most of the gain control range while keeping distortion (Output IP3) constant. The result is that NF is improved up to 16 dB vs. a standard VGA at low gain settings. The graph below illustrates this by showing the IDTF1200 NF and IP3O vs. Gain setting contours. 50 Output IP3 40 35 30 y 25 tar 20 10 Noise Figure 5 0 0 2 4 6 8 10 12 16 18 20 22 RevO ID T Gain (dB) 14 Pr -2 rie 15 op NF (dB) and Output IP3 (dBm) 45 Page 2 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 IDTF1200 SPECIFICATION VCC = +5.0V, fRF = 100MHz, TC= +25°C, STBY = GND, R6 = 2.87K +/-1%, POUT = +3 dBm, unless otherwise noted in the condition column. EVkit trace, transformer & matching losses are de-embedded for specification purposes (note: de-embedded losses = 0.4dB input and 0.4dB output at 100MHz). Parameter Condition Operating Temp. Range Symbol Case Temperature Measured at the exposed paddle typ TC Logic Input High VIH Logic Input Low VIL Logic Current min max -40 to +85 C 1 2.0 IIH, IIL units V -1 0.8 V +1 μA Operating voltage range Analog & Digital Supplies VCC Supply Current Total, All VCC; R6= 2.87K +/-1% ISUPP Standby Current Total, All VCC All digital inputs at 2.0VDC VCC=5.25VDC ISTBY Frequency Range Output IP3 > +40 dBm fRF 50 to 160 MHz Input Resistance Differential RIN 200 Ω Output Resistance Differential ROUT 200 Ω Maximum Gain GC = [0000000] GMAX 20.7 21.7 22.6 dB Minimum Gain GC = [1011101] GMIN -2.8 -1.7 -0.7 dB Gain Step 4.75 to 5.25 103 110 LSB V 117 mA 2.5 mA 0.25 dB ΔΦ due to change in gain ΦSLOPE 0.3 deg/dB Differential Gain Error Between adjacent 1dB steps DNL .05 dB Integral Gain Error Error vs. straight line INL +/-0.20 dB Noise Figure At Maximum Gain NF 2.6 dB Noise Figure GC = [0110100] (gain = 9dB) NFBACK 4.55 dB Output IP3 Set code = 0000000, (GMAX) Pout = +3 dBm per tone 800 KHz Tone Separation IP3O1 48 dBm Set code = 0110100,, (Gain = 9dB) Pout = +3 dBm per tone 800 KHz Tone Separation IP3O2 44 T1dB 15 Gain Step from 22 to 21 dB setting Settles to within 0.1 dB of final value FRF = 100 MHz 2 Harmonic Set code = 0000000, (GMAX) Pout = +3 dBm # Control Bits Parallel 1 dB Compression Set code = 0000000, (GMAX) Single Tone Test H2 CB P1dBO ID RevO +16.7 tar dBm nsec -82 dBc 7 # +19.4 dBm T 1 –Items in bold italics are Guaranteed by Test 2 – See Graph on Page 8 rie nd 2 op Settling Time Pr Output IP3 – at Gback y Phase Slope Page 3 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 TYPICAL OPERATING PARAMETRIC CURVES (GMAX, 5.00V, 25C, POUT +3 dBm, 100MHz unless otherwise noted) Gain vs. Voltage 25 25 20 20 15 15 Gain (dB) Gain (dB) Gain vs. Temperature 10 -40C 5 25C 10 85C 4.75V 5 0 50 100 150 200 250 300 0 50 100 Frequency (MHz) 200 250 300 250 300 S22 vs. Temperature 0 -10 -10 Output Gamma [s22] (dB) 0 -20 -30 -40 150 Frequency (MHz) S11 vs. Temperature -40C 25C -20 -30 -40 85C -50 -40C 25C 85C -50 0 50 100 150 200 250 300 0 50 100 Frequency (MHz) 150 y Gain and NF vs. Frequency (measured w/NF meter) 24 tar 0 22 20 -10 -30 rie -20 16 14 Gain 12 10 8 25C 85C 4 2 0 -50 0 50 100 150 200 250 30 300 50 70 90 110 130 150 170 Frequency (MHz) ID T Frequency (MHz) RevO Pr 6 -40C Noise Figure op Gain and NF (dB) 18 -40 200 Frequency (MHz) S12 vs. Temperature Reverse Isolation [s12] (dB) 5.25V 0 0 Input Gamma [s11] (dB) 5.00V Page 4 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 TOCS CONTINUED S22 vs. Gain Setting 0 0 -5 -5 -10 -10 -15 -15 Output Gamma (dB) Input Gamma (dB) S11 vs. Gain Setting -20 -25 -30 50 MHz -35 100 MHz -40 150 MHz -20 -25 -30 -35 50 MHz -40 100 MHz 150 MHz -45 -45 -50 -50 -1 3 7 11 15 19 -1 23 3 7 15 22 40 20 35 23 Normalized S21 Phase response (degrees) 50 MHz 18 16 14 12 10 8 6 50 MHz 4 100 MHz 2 150 MHz 0 100 MHz 30 150 MHz 25 20 15 10 5 0 -5 -10 -2 -1 3 7 11 15 19 -1 23 3 7 11 15 NF correction Correct EVkit measured Output IP3 by this amount to account for trace & transformer losses y 1.8 IP3 correction 1.6 Correct EVkit measured Gain by this amount to account for trace & transformer losses 0.0 -0.4 1.2 1.0 0.8 op EVkit Loss (dB) 0.4 rie 1.4 0.8 0.6 Correct EVkit measured Noise Figure by this amount to account for trace & transformer losses 0.2 0.0 -1.6 0 0 50 100 150 200 250 300 50 100 150 200 250 300 Frequency (MHz) ID T Frequency (MHz) RevO Pr 0.4 -0.8 tar 2.0 1.6 -1.2 23 EVKit Gain Correction EVKit NF & Output IP3 Correction 1.2 19 Gain Setting (dB) Gain Setting (dB) Correction (dB) 19 S21 Phase vs. Gain Setting S21 vs. Gain Setting Gain (dB) 11 Gain Setting (dB) Gain Setting (dB) Page 5 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 TOCS CONTINUED DNL vs. Voltage (100 MHz, 1dB Steps) 0.20 0.20 0.15 0.15 0.10 Differential Non-Linearity (dB) Differential Non-Linearity (dB) . DNL vs. Frequency (1dB Steps) 100 MHz 80 MHz 120 MHz 0.05 0.00 -0.05 50 MHz 30 MHz -0.10 0.10 5.25V 0.05 0.00 -0.05 -0.15 -0.15 -0.20 -0.20 -1 1 3 5 7 9 11 13 15 17 19 -1 21 1 3 5 7 0.20 0.15 0.15 Differential Non-Linearity (dB) Differential Non-Linearity (dB) 0.20 -40C 0.05 0.00 -0.05 25C 85C 11 13 15 17 19 21 DNL vs. Temperature (100 MHz, 0.5dB Steps) DNL vs. Temperature (100 MHz, 1dB Steps) 0.10 9 Gain Setting (dB) Gain Setting (dB) -0.10 -40C 0.10 0.05 0.00 -0.05 25C 85C -0.10 -0.15 -0.15 -0.20 -0.20 -1 1 3 5 7 9 11 13 15 17 19 -1 21 1 3 5 7 9 11 13 120 MHz 0.00 -0.05 85C 0.10 0.00 100 MHz -0.10 -0.20 -0.30 -0.15 -0.40 -0.20 3 5 7 9 11 13 15 17 19 50 MHz -1 21 rie 0.05 0.20 op 0.10 Pr Cumulative Gain Error (dB) -40C 1 21 y 0.30 0.15 -1 19 tar 0.40 0.20 25C 17 INL vs. Frequency DNL vs. Temperature (100 MHz, 0.25dB Steps) -0.10 15 Gain Setting (dB) Gain Setting (dB) Differential Non-Linearity (dB) 5.00V 4.75V -0.10 1 3 5 7 9 11 13 15 17 19 21 Gain Setting (dB) RevO ID T Gain Setting (dB) Page 6 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 TOCS CONTINUED INL vs. Voltage (100 MHz) INL vs. Temperature (100 MHz) 0.40 0.40 -40C 0.20 0.10 0.00 -0.10 -0.20 5.00V 0.30 25C Cumulative Gain Error (dB) Cumulative Gain Error (dB) 0.30 5.25V 0.20 0.10 0.00 4.75V -0.10 -0.20 85C -0.30 -0.30 -0.40 -0.40 -1 1 3 5 7 9 11 13 15 17 19 -1 21 1 3 5 7 9 20 18 18 16 16 14 14 Noise Figure (dB) Noise Figure (dB) 20 100 MHz 10 150 MHz 8 15 17 19 21 12 5.00V 10 4.75V 8 6 6 4 4 5.25V 50 MHz 2 2 0 0 -1 1 3 5 7 9 11 13 15 17 19 -1 21 1 3 5 7 9 11 13 23 16 22 85C 8 6 4 20 19 18 7 9 11 13 15 17 19 Pr 15 0 5 4.75V 17 16 -40C 2 3 rie 25C 14 80 MHz 21 Gain Setting (dB) 5.00V 5.25V 21 op Output P1dB (dBm) 14 1 21 tar 24 18 -1 19 y 20 10 17 Output P1dB vs. Voltage Noise Figure vs. Temperature (100 MHz) 12 15 Gain Setting (dB) Gain Setting (dB) Noise Figure (dB) 13 Noise Figure vs. Voltage (100 MHz) Noise Figure vs. Frequency 12 11 Gain Setting (dB) Gain Setting (dB) 100 MHz 120 MHz RevO ID T Frequency (MHz) Page 7 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 TOCS CONTINUED Output IP3 vs. Voltage (100 MHz) Output IP3 vs. Frequency 60 60 55 55 50 50 Output IP3 (dBm) Output IP3 (dBm) 4.75V 45 40 IP3- 35 IP3+ 5.00V 40 5.25V 35 30 25 4.0E+07 45 30 6.0E+07 8.0E+07 1.0E+08 1.2E+08 1.4E+08 25 -1.25 1.6E+08 10 Frequency (Hz) 22 Gain Setting (dB) 2nd Harmonic vs. Temperature (100 MHz) Output IP3 vs. Temperature (100 MHz) -50 60 2nd Harmonic w/+3 Pout (dBc) 55 -40C 25C Output IP3 (dBm) 50 45 40 85C 35 -60 -70 25C -80 85C -90 30 -40C 25 -1.25 10 -100 -1.25 22 10 22 Gain Setting (dB) Gain Setting (dB) Settling Time (1 dB Step, 100 MHz) RevO ID T Pr op rie tar y Settling Time (16dB Step, 100 MHz) Page 8 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 PIN DIAGRAM TOP View (looking through the top of the package) ATTN_OUT- AMP_IN- E_AMP AMP_IN+ Bias_Amp VCC Amp_Bias 27 26 25 24 23 22 m m ATTN_OUT+ Exposed Pad 0. 35 1 21 ISET 20 STBY 19 AMP_OUT - 18 AMP_OUT + C O GND 28 VCC ATTN 2 ATTN_IN + 3 ATTN_IN - 4 GND Package Drawing 5 mm x 5 mm package dimension 3.25 mm x 3.25 mm exposed pad 0.5 mm pitch 28 pins 0.75 mm height 5 17 VMODE 0.25 mm pad width 12 13 14 GC2 GC1 GC0 VCC DIG y 11 15 tar 10 DIG_GND rie 9 16 RevO ID T Pr op 8 GC3 7 GC4 GND 0.40 mm pad length GC5 6 GC6 GND Page 9 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 RevO ID T Pr op rie tar y PACKAGE DRAWING Page 10 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 PIN DESCRIPTIONS Pin # Pin Name GND VCC_ATTN ATTN_IN+ ATTN_INGround Ground Ground GC6 GC5 GC4 GC3 GC2 GC1 GC0 VCC_DIG DIG_GND VMODE 18 19 20 21 AMP_OUT+ AMP_OUTSTBY ISET 22 23 24 25 26 27 28 VCC_Amp_Bias Bias_Amp AMP_IN+ E_Amp AMP_INATTN_OUTATTN_OUT+ Exposed Paddle Function Attenuator Power Supply Attenuator_0 Differential Input P Attenuator_0 Differential Input M Untested - SPI Chip Select Input Untested - SPI Data Input Untested - SPI Clock Input Parallel Gain Control Input – MSB (16 dB step) Parallel Gain Control Input Parallel Gain Control Input Parallel Gain Control Input Parallel Gain Control Input Parallel Gain Control Input Parallel Gain Control Input – LSB (0.25 dB step) Digital Circuit Power Supply Connect directly to Ground Untested – SPI Enable Connect to PCB GND for normal parallel operation Amplifier Differential Output P Amplifier Differential Output M Amplifier Power Down. Ground for Normal operation Current Setting Resistor. Connect recommended value (2.87K) to ground. Use 1% tolerance Amplifier and Bias Circuit Power Supply Amplifier Bias External Pin for Decoupling Capacitor Amplifier Differential Input P Amplifier Common Emitter Amplifier Differential Input M Attenuator_0 Differential Output M Attenuator_0 Differential Output P RevO ID T Pr op rie tar y 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Page 11 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 EVKIT / APPLICATIONS CIRCUIT SCHEMATIC The diagram below describes the recommended applications / EVkit circuit: Vcc C4 C1 C9 C2 Vcc C8 24 23 VCC Amp_Bias 25 Bias_Amp 26 AMP_IN+ 27 E_AMP 28 AMP_IN- C10 ATTN_OUT- ATTN_OUT+ Vcc JP1 R4 22 C11 GND VCC ATTN 1 21 Bias Control 2 20 ISET R6 STBY L1 ATTN_IN + ATTN_IN - C24 T1 GND [CS] GND [DATA] GND [CLK] 3 19 4 18 5 17 6 Decode Logic SPI (Untested) 16 15 7 T2 AMP_OUT C13 Vcc AMP_OUT + VMODE C23 C17 L2 DIG_GND Coilcraft 1008CS C20 VCC DIG R13 R14 GC6 R15 GC5 JP3 C19 R16 8 GC4 9 10 11 12 13 14 GC2 GC1 Vcc GC0 GC1 GC2 GC3 GC4 R20 GC5 R19 Vcc GC0 C21 13 11 9 7 5 3 1 14 12 10 8 6 4 2 Vcc y GC3 R18 GC6 R11 R17 C22 tar JP5 RevO ID T Pr op rie Vcc Page 12 of 13 April, 2011 DATASHEET Intermediate Frequency Digital Variable Gain Amplifier IDTF1200 EVKIT & BOM (Email: [email protected] to request Controller SW and Cable) The picture and table below describes the recommended EVkit operation and BOM * Serial Mode Untested, Not Guaranteed to Work Power Up: DC Power •Closed = On ISET 5x5 QFN Device •Open = Off EVB Serial # Pullup Inductors Output 4:1 Balun Transformer Input 4:1 Balun Transformer AMP_OUT 50 Ω ATTN_IN 50 Ω SPI* VMODE •Closed = Parallel Control •Open = Serial Control* VCC Item # Value GC [0[0-6] REF / MONITOR Size Desc Mfr. Part # Mfr. Ref Des 4:1 Balun SM-22 4:1 Center Tap Balun TC4-1TG2+ Mini Circuits T1,T2 2 2.87k 0402 RES 2.87K OHM 1/10W 1% 0402 SMD ERJ-2RKF2871X Panasonic R6 3 47k 0402 Pullup resistors for STBY and VMODE jumpers RC0402FR-0747KL Yageo R4, R13 4 0 0402 RES 0.0 OHM 1/10W 0402 SMD ERJ-2GE0R00X Panasonic 5 680 nH 1008 RF inductor, ceramic core, 5% tol, SMT, RoHS 1008CS-681XJLC Coilcraft 6 10 nF 0402 CAP CER 10000PF 16V 10% X7R 0402 GRM155R71C103KA01D MURATA 7 1000 pF 0402 CAP CER 1000PF 50V C0G 0402 GRM1555C1H102JA01D MURATA C4,C10,C13,C19 8 0.1uF 0402 CAP CER .1UF 10V 10% X5R 0402 GRM155R61A104KA01D MURATA C9,C11,C17,C20 9 SMA .062 SMA_END_LAUNCH 142-0711-821 Emerson Johnson J1,J2,J3 10 Header_2Pin TH_2 CONN HEADER VERT SGL 2POS GOLD 961102-6404-AR 3M JP1,JP3 11 Header_14Pin TH_7x2 CONN HEADER 14 POS STRGHT GOLD N2514-6002-RB 3M JP5 12 F1200ZD IF VGA Q01B005M IDT U1 13 PCB 14 DNP tar R11 L1,L2 Pr op rie C1,C2,C8,C23,C24 0402 Resistors to ground on Gain ctrl lines T F1200 EV Kit Rev 1 ID RevO QFN-28 y 1 Page 13 of 13 R14 thru R20 April, 2011