INTEGRATED CIRCUITS
SA621
1GHz - Low voltage LNA, mixer and VCO
Product specification |
1997 Nov 07 |
IC17 Data handbook
m n r
Philips Semiconductors |
Product specification |
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1GHz low voltage LNA, mixer and VCO |
SA621 |
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DESCRIPTION
The SA621 is a combined low-noise amplifier, mixer and VCO designed for high-performance low-power communication systems from 800-1000MHz. The low-noise preamplifier has a 1.7dB noise figure at 881MHz with 15dB gain and an IP3 intercept of -7dBm at the input. The gain is stabilized by on-chip compensation to vary less than ±0.2dB over -40 to +85°C temperature range. The wide-dynamic-range mixer has a 12dB noise figure and IP3 of +4.5dBm at the input at 881MHz. The integrated VCO circuit with external resonator produces a high quality LO signal that drives the mixer and is buffered to an external PLL synthesizer IC. The nominal current drawn from a single 3V supply is 13.3mA. Additionally, the entire circuit can be powered down to further reduce the supply current to less than 20μA.
FEATURES
•Low current consumption
•Outstanding gain and noise figure
•Excellent gain stability versus temperature and supply voltage
•LNA, mixer and VCO power down capability
•Monotonic VCO frequency vs control voltage
PIN CONFIGURATION
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PD1 |
1 |
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20 |
MIXER OUT |
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PD2 |
2 |
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19 |
MIXER OUT |
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GND |
3 |
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18 |
GND |
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LO OUT |
4 |
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17 |
MIXER IN |
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GND |
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16 |
GND |
GND |
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LNA IN |
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6 |
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15 |
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TANK |
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14 |
GND |
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GND |
8 |
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13 |
LNA OUT |
GND |
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9 |
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12 |
VCC |
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BYPASS |
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GND |
10 |
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11 |
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SR01429
Figure 1. Pin Configuration
APPLICATIONS
•900MHz cellular and cordless front-end
•Spread spectrum receivers
•RF data links
•UHF frequency conversion
•Portable radio
ORDERING INFORMATION
DESCRIPTION |
TEMPERATURE RANGE |
ORDER CODE |
DWG # |
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20-Pin Thin Shrink Small Outline Package (Surface-mount, TSSOP) |
-40 to +85°C |
SA621DH |
SOT360-1 |
BLOCK DIAGRAM
MIXER |
MIXER |
GND |
MIXER |
GND |
LNA |
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LNA |
VCC |
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OUT |
OUT |
IN |
IN |
GND |
OUT |
GND |
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20 |
19 |
18 |
17 |
16 |
15 |
14 |
13 |
12 |
11 |
10pF |
10pF |
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LNA |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
PD1 |
PD2 |
GND |
LO |
GND |
GND |
TANK |
GND |
GND |
BYPASS |
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OUT |
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SR01428
Figure 2. SA621 Block Diagram
1997 Nov 07 |
2 |
853-1849 018660 |
Philips Semiconductors |
Product specification |
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1GHz low voltage LNA, mixer and VCO |
SA621 |
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ABSOLUTE MAXIMUM RATINGS
SYMBOL |
PARAMETER |
RATING |
UNITS |
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V |
Supply voltage1 |
-0.3 to +6 |
V |
CC |
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VIN |
Voltage applied to any other pin |
-0.3 to (VCC + 0.3) |
V |
PD |
Power dissipation, TA = 25°C (still air)2 |
980 |
mW |
20-Pin Plastic SSOP |
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TJMAX |
Maximum operating junction temperature |
150 |
°C |
PMAX |
Maximum power input/output |
+20 |
dBm |
TSTG |
Storage temperature range |
±65 to +150 |
°C |
NOTE:
1.Transients exceeding 8V on VCC pin may damage product.
2.Maximum dissipation is determined by the operating ambient temperature and the thermal resistance,
θJA: 20-Pin SSOP = 110°C/W 3. Pins 19 and 20 are ESD sensitive (mixer outputs).
RECOMMENDED OPERATING CONDITIONS
SYMBOL |
PARAMETER |
RATING |
UNITS |
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VCC |
Supply voltage |
2.7 to 5.5 |
V |
TA |
Operating ambient temperature range |
-40 to +85 |
°C |
TJ |
Operating junction temperature |
-40 to +105 |
°C |
DC ELECTRICAL CHARACTERISTICS
VCC = +3.0V, |
TA = 25°C; unless otherwise stated. |
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SYMBOL |
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PARAMETER |
TEST CONDITIONS |
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LIMITS |
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UNITS |
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MIN |
TYP |
MAX |
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Full power-on |
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13.3 |
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mA |
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ICC |
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Supply current |
LNA powered-down |
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10 |
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mA |
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Standby (VCO + bias) |
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5.7 |
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mA |
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Full power-down |
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20 |
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μA |
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VT |
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PD logic threshold voltage |
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1.2 |
1.6 |
1.8 |
V |
VIH |
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Logic 1 level |
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2.0 |
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VCC |
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VIL |
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Logic 0 level |
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±0.3 |
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0.8 |
V |
IIL |
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PD1 input current |
Enable = 0.4V |
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10 |
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μA |
IIH |
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PD2 input current |
Enable = 2.4V |
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10 |
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μA |
1997 Nov 07 |
3 |
Philips Semiconductors |
Product specification |
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1GHz low voltage LNA, mixer and VCO |
SA621 |
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AC ELECTRICAL CHARACTERISTICS
VCC = +3.0V, TA = 25°C; RFIN = 881MHz, fVCO = 964MHz; unless otherwise stated.
SYMBOL |
PARAMETER |
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TEST CONDITIONS |
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LIMITS |
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UNITS |
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±3 |
TYP |
+3 |
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Low Noise Amplifier |
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fRF |
RF input frequency range |
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800 |
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1000 |
MHz |
S21 |
Amplifier gain |
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15 |
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dB |
S21 |
Amplifier gain in power-down mode |
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-28 |
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dB |
DS21/DT |
Gain temperature sensitivity enabled |
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0.006 |
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dB/°C |
DS21/Df |
Gain frequency variation |
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800MHz - 1.0GHz |
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±0.013 |
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dB/MHz |
S12 |
Amplifier reverse isolation |
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@ 881 MHz |
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-28 |
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dB |
S11 |
Amplifier input match |
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With ext. impedance matching |
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-10 |
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dB |
S22 |
Amplifier output match |
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-10 |
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dB |
P-1dB |
Amplifier input 1dB gain compression |
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-20 |
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dBm |
IP3 |
Amplifier input third order intercept |
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-7 |
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dBm |
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NF |
Amplifier noise figure |
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1.7 |
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dB |
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tON |
Amplifier turn-on time (Enable Lo → Hi) |
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120 |
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tOFF |
Amplifier turn-off time (Enable Hi → Lo) |
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0.3 |
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ms |
Mixer |
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PGC |
Mixer power conversion gain: RP = RL |
= 1.2kW, |
fRF = 881MHz, fLO = 964MHz, |
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8.7 |
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dB |
fIF = 83MHz |
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S11M |
Mixer input match |
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Ext. impedance matching req. |
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-10 |
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dB |
NFM |
Mixer SSB noise figure |
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12 |
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dB |
P-1dB |
Mixer input 1dB gain compression |
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-10 |
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dBm |
IP3M |
Mixer input third order intercept |
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4.5 |
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dBm |
IP2INT |
Mixer input second order intercept |
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15 |
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dBm |
PRFM-IF |
Mixer RF feedthrough |
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RFIN = -25dBm |
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-41 |
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dBm |
PLO-IF |
LO feedthrough to IF |
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LO = -10dBm |
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-23 |
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dBm |
PLO-RFM |
LO to mixer input feedthrough |
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-52 |
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dBm |
PLO-RF |
LO to LNA input feedthrough |
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-38 |
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dBm |
Voltage |
Controlled Oscillator (VCO)1 |
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fVCO |
VCO frequency range |
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883 |
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1083 |
MHz |
PVCO |
VCO power out |
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See Figure 3 |
-10 |
-8 |
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dBm |
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VCO phase noise2 |
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Offset = 30kHz |
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-109 |
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dBc/Hz |
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Offset = 60kHz |
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-115 |
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Harmonic content |
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-22 |
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dBc |
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Residual modulation |
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45 |
dB |
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Pulling figure |
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VSWR=2:1, all phases |
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±500 |
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kHz |
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Pushing figure |
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±100 |
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kHz/V |
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Overall System |
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GSYS |
System gain |
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LNA + Mixer |
23.0 |
23.7 |
24.4 |
dB |
NOTES:
1.VCO performance dependent on external components.
2.Based on copper-plated 2mm ceramic resonator (1/4 wave), f = 1025MHz, and can be improved by silver-plated or larger resonators.
1997 Nov 07 |
4 |
Philips Semiconductors |
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Product specification |
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1GHz low voltage LNA, mixer and VCO |
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SA621 |
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Table 1. Power ON/OFF Control Logic |
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PD1 |
PD2 |
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0 |
0 |
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Full chip power-down |
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0 |
1 or open |
VCO on, Mixer on, LNA power-down |
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1 or open |
0 |
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VCO on, LNA and Mixer power-down |
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1 or open |
1 or open |
Full chip power-on (default) |
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C1 |
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100pF |
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L6 |
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12nH |
L3 |
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L1 |
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C2 |
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6.8nH |
C8 |
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+ VCC |
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C3 |
560nH |
10nF |
C11 10nF |
10nF |
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3V |
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6.8pF |
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IFOUT |
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C10 |
C14 |
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C13 |
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C9 |
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L4 |
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2.2pF |
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33pF |
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0.1μF |
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6.8pF |
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560nH |
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20 |
19 |
18 |
17 |
16 |
15 |
14 |
13 |
12 |
11 |
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MIXER |
MIXER GND |
MIXER |
GND |
LNA |
GND |
LNA |
VCC |
GND |
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OUT |
OUT |
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IN |
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IN |
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OUT |
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SA621 |
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C4 |
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2.2pF |
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PD1 |
PD2 |
GND |
LOOUT |
GND |
GND |
TANK |
GND |
GND |
BYPASS |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
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MURATA 2mm |
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VCO |
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1/4 WAVE |
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D1 |
CONTROL |
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FREQ=1025MHz |
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R2 |
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R1 |
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24Ω |
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L7 |
D7 |
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C6 |
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C12 |
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C5 |
5.1kΩ |
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100pF |
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C10 |
.5pF |
18.5nH |
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10nF |
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220pF |
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Hi±Q |
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10nF |
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VCOOUT |
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SR01424 |
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Figure 3. SA621 Applications Circuit
1997 Nov 07 |
5 |
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