[AK1291] AK1291 IF Variable Gain Amplifier with RSSI 1. Overview AK1291 is a variable gain amplifier with a power detector. It’s operating frequency ranges from 100MHz to 300MHz. The gain control adopts an analog signal control, and the gain characteristic is dB linear. The gain control range is -9dB to +21dB and a dynamic range is 30dB. AK1291 has single-ended input and output, with impedance of 50 Ω. As a typical characteristic, NF is 7dB (at maximum gain) , and IMD3 is 70dBc at output power of -15dBm ,at frequency of 165MHz.The power supply voltage is 4.75V to 5.25V. 2. Feature ▪Operation Frequency Range ▪Gain variable range ▪Noise Figure ▪IMD3 ▪Supply Voltage ▪Operating Temperature ▪Package 100MHz to 300MHz -9dB to 21dB 7dB @max gain 70dBc @output power -15dBm 4.75V to 5.25V -40°C to +85°C 24pin QFN0404 3. Block Diagram VSS6 COM VSS5 IAVDD OAVD VSS4 VSS1 VSS3 RFINP RFOUT Buffer RFINN PVDD DETVDD GCON Detector DETIN VSS2 BIAS ENAB DETOUT Fig 1. Block Diagram MS-E-1148-00 2012/11 -1- [AK1291] Content 1. Overview ................................................................................................................. 1 2. Feature ..................................................................................................................... 1 3. Block Diagram ........................................................................................................ 1 4. Pin Configuration .................................................................................................... 3 5. Pin function Description.......................................................................................... 4 6. Maximum Absolute Rating ..................................................................................... 5 7. Recommended operational condition...................................................................... 5 8. Electrical Characteristic ........................................................................................... 6 9. Interface circuit........................................................................................................ 8 10. Evaluation Board Schimatic.................................................................................. 10 11. Typical Performance ............................................................................................. 11 12. Marking ................................................................................................................. 13 13. Outer Dimensions.................................................................................................. 14 MS-E-1148-00 2012/11 -2- [AK1291] VSS1 1 RFINP 2 RFINN 3 PVDD 4 GCON 5 VSS2 6 VSS5 OAVDD VSS4 23 22 21 20 19 11 12 TEST3 TEST4 Fig 2 10 TEST2 9 TEST1 BIAS 8 ENAB 7 IAVDD 24 COM TOP VIEW VSS6 4. Pin Configuration 18 VSS3 17 RFOUT 16 DETVD 15 DETIN 14 DETOU 13 TEST5 Pin Configuration 5. Block Function Block VGA Power Detector Function Variable Gain Amplifier which is controlled by the voltage of 0.2 to 2.5V Power detector which detect power level of VGA output MS-E-1148-00 2012/11 -3- [AK1291] 6. Pin function Description Pin No 1 2 3 4 5 6 Table 1. Pin function function Name VSS1 RFINP RFINN PVDD GCON VSS2 I/O G AI AI P AI G 7 BIAS AIO 8 ENAB DI Power down control 9 10 11 12 13 14 15 16 17 18 19 20 21 22 TEST1 TEST2 TEST3 TEST4 TEST5 DETOUT DETIN DETVDD RFOUT VSS3 VSS4 OAVDD VSS5 IAVDD: DI DI DI DI DO AO AI P AO G G P G P 23 COM AIO 24 VSS6 G Test pin Test pin Test pin Test pin Test pin Detector output Detector input Power supply RF output Ground Ground Power supply Ground Power supply Pin for input common voltage Ground Ground RF input Positive RF input Negative Power Supply Control voltage input Ground Resistance connection pin for current adjustment Remark No resistance is connected. ENAB=”High” Power on ENAB=”Low” Power down Connect to ground Connect to ground Connect to ground。 Connect to ground Connectionless connect a capacitor of 10pF to ground connect a resistor of 50Ω to ground connect a capacitor of 10nF to ground The exposed pad at the center of the backside should be connected to ground. Note) the exposed pad at the center of the backside should be connected to ground. AI:Analog input pin AO:Analog output pin DI: Digital Input pin DO：Digital Output pin P: Power supply pin G: Ground pin 25 EXPAD G Ground ＊About power down control: The power down of the whole IC is done by ENAB (pin8). In the case that ENAB is “High”, VGA block and Detector block are power on state. In the case that let only Detector block power down, connect DETVDD to the ground. MS-E-1148-00 2012/11 -4- [AK1291] 7. Absolute Maximum Rating Table 2. Absolute Maximum rating 項目 記号 Min. Max. 単位 Supply Voltage VDD -0.3 5.5 V Ground Level VSS 0 0 V Analog input voltage VAIN -0.3 VDD+0.3 V VDIN -0.3 VDD+0.3 RFINP/RFINN Pmax +10 Maximum input Level Storage Tstg -55 125 Temperature Note1) All voltage reference ground Level: 0V V 備考 Applied to [PVDD]、[IAVDD]、 [OAVDD]、[DETVDD] note1) Applied to [VSS1]、[VSS2] 、 [VSS3] 、[VSS4] 、[VSS5] 、 [VSS6] and [EXPAD] Applied to [RFINP]、[RFINN]、 [GCON] and [DETIN] Applied to [ENAB] note1) dBm °C Exceeding these maximum ratings may result in damage to the AK1291. Normal operation is not guaranteed at these extremes 8. Recommended operational condition Table 3. Recommended operational condition 項目 Operating Temperature 記号 Ta Min. Typ. -40 Max. 単位 85 °C 備考 Applied to [PVDD]、 [IAVDD]、[OAVDD]、and [DETVDD] Each specification is applied in the power supply voltage and the operating temperature applied to recommended operational condition. Supply Voltage VDD 4.75 5 5.25 MS-E-1148-00 V 2012/11 -5- [AK1291] 9. Electrical Characteristic DC Characteristic Item High Level Input Voltage Low Level Input Voltage Input leak current Symbol VIH VIL IIL Current consumption 1 ICC1 Current consumption 2 ICC2 Current consumption 3 ICC3 Condition Note1) Note1) Note1) PVDD=OAVDD=IAVDD= DETVDD=VDD， ENAB=High PVDD=OAVDD=IAVDD ＝VDD、DETVDD=VSS、 ENAB=High PVDD=OAVDD=IAVDD ＝VDD、DETVDD=VSS、 ENAB=Low Min. 0.8*VDD 0.0 -10 Typ. Max. 0.2*VDD 10 Unit V V µA 155 199 mA 151 195 mA 10 µA Note1) Applied to [ENAB] pin。 AC Characteristic PVDD=OAVDD=IAVDD=4.75V～5.25V, Ta=-40°C～85°C f0=165MHz, unless otherwise specified Item Symbol Condition Min. Typ. Max. VGA Block Input Frequency FOP 100 300 Input Impedance IIMP 50 Output Impedance OIMP 50 Gain control Range GCONT 30 Max. Gain GMAX GCON=2.5V 21 Min. Gain GMIN GCON=0.2V -6.5 Gain 1 Ga1 GCON=2V 21 Gain 2 Ga2 GCON =0.5V -9 Gain control voltage VGT 0.2 2.5 range Gain curve slope GCS 1 20 80 0.5V≦VGCONT≦2.0V note1) Gain step response GSR 5 <RFIN=100MHz> Noise Figure note2) NF Gain = 21 dB 7 Output P1dB OP1 5 IMD3 IMD3 Output Level = -15dBm 65 70 <RFIN=165MHz> Noise Figure note2) NF Gain = 21 dB 7 Output P1dB OP1 5 IMD3 IMD3 Output Level = -15dBm 65 70 <RFIN=300MHz> Noise Figure note2) NF Gain = 21 dB 7 Output P1dB OP1 5 IMD3 IMD3 Output Level = -15dBm 55 60 MS-E-1148-00 Unit MHz Ω Ω dB dB dB dB dB V dB/V µS dB dBm dBc dB dBm dBc dB dBm dBc 2012/11 -6- [AK1291] Detector Block Input Frequency range Output voltage Level 1 Output voltage Level 2 Temperature dependency note 2) FOP２ Det_H Det_H Detvdev 100 DETIN=-15dBm DETIN=-35dBm Refer to 25°C 0.5 1.6 0.9 ±1 500 2.2 MHz V V dB Note1) guaranteed monotonicity Note2) guaranteed by design MS-E-1148-00 2012/11 -7- [AK1291] 10. Interface circuit Pin No 2 Pin Name RFINP 3 RFINN 5 GCON I/O I RF input I Interface circuit Analog Input 300Ω 7 BIAS 23 COM 17 RFOUT I/O Analog Input/Output 300Ω O RF output MS-E-1148-00 2012/11 -8- [AK1291] Pin No. 8 Pin Name ENAB I/O I Digital input Pull-Down 9 TEST1 10 TEST2 11 TEST3 12 TEST4 13 TEST5 O Digital output 14 DETOUT O Output Interface Circuit 300Ω 100kΩ 300Ω 15 DETIN I RF input MS-E-1148-00 2012/11 -9- [AK1291] 11. Evaluation Board Schimatic VDD 0.1uF 1nF VDD 1nF 0.1uF IINPUT 10nF VDD 0.1uF VSS4 OAVD VSS5 IAVD COM VSS6 1nF VSS1 VSS3 RFINP RFOUT RFINN DETVDD PVDD DETIN GCON DETOUT VSS2 TEST5 10nF IOUTPUT 10nF 1nF 0.1uF Detector INPUT 1nF 10nF TEST4 TEST3 TEST2 TEST1 ENAB BIAS 51Ω Detector OUTPUT 10pF Gain Control VDD Fig 3. Typical Evaluation Board Schimatic MS-E-1148-00 2012/11 - 10 - [AK1291] 12. Typical Performance Unless otherwise noted, PVDD=OAVDD=IAVDD=DETVDD=5V, Ta=25℃, Freq=165MHz 1. Gain vs Analog Controll Voltage Fig.4-1 Gain VS Control Voltage(fo=100MHz) Fig.4-1 Gain VS Control Voltage(fo=165MHz) Fig.4-1 Gain VS Control Voltage(fo=300MHz) MS-E-1148-00 2012/11 - 11 - [AK1291] 2. Noise Figure Fig.5-1 NF VS Gain Fig.5-2 NF VS Gain (fo=165MHz) (Temp =25°C) 3. IMD3 Fig.6-1 IMD3 VS Gain Fig.6-2 IMD3 VS Gain (Temp =25°C) MS-E-1148-00 (fo=165MHz) 2012/11 - 12 - [AK1291] 13. Marking (a) Style : QFN (b) Number of pins : 24 (c) 1 pin marking: ○ (d) Product number : 1291 (e) Date code : YWWL (4 digits) Y: Lower 1 digit of calendar year (Year 2013 → 3, 2014 → 4 ...) WW: Week L: Lot identification, given to each product lot which is made in a week → LOT ID is given in alphabetical order (A, B, C…). 1291 YWWL (d) (e) ●(c) MS-E-1148-00 2012/11 - 13 - [AK1291] 14. Outer Dimensions HWQFN24-4×4-0.5 Note) the exposed pad at the center of the backside should be connected to ground. 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