Electrical Characteristics

Electrical Characteristics
(V_CC = 2.7V to 3.3V, T_A = -40°C to +85°C. Registers are set to the specified default states. LNA input is driven from a 50Ω source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set to GAININ = 111010 through SPI interface, unless otherwise noted. Maximum IF output load is not to exceed 10kΩ||7.5pF on each pin. Typical values are at V_CC = 2.85V and T_A = +25°C, unless otherwise noted. (Note 1))
PARAMETER	SYMBOL	CONDITIONS	MIN	TYP	MAX	UNITS
DC ELECTRICAL CHARACTERISTICS
Supply Voltage	V_CC		2.7	2.85	3.3	V
Supply Current		Default mode, high-band LNA and mixer input is active (Note 2)		26		mA
		Default mode, low-band LNA and mixer input is active (Note 2)		27
		Idle Mode^TM, IDLE bit is 1, SHDN = high		5
		Shutdown mode, SHDN = low		200		μA
Digital Input Logic-High	V_IH	Measure at the SHDN pin	1.5			V
Digital Input Logic-Low	V_IL	Measure at SHDN pin			0.4	V
AC ELECTRICAL CHARACTERISTICS / CASCADED RF PERFORMANCE
RF Frequency		L1 band		1575.42		MHz
RF Frequency - L2/L5 Band		L2/L5 band		1227.6		MHz
Noise Figure		High band LNA input active, default mode (Note 3)		1.4		dB
Noise Figure - L2/L5 Band		L2/L5 band (Note 6). Low-band LNA input active, default mode (Note 3)		1.6		dB
Noise Figure		Measured at the high-band mixer input		10.3		dB
Noise Figure - L2/L5 Band		L2/L5 band (Note 6). Measured at the low-band mixer input		10.3		dB
Out-of-Band 3rd-Order Input Intercept Point		Measured at the high-band mixer input (Note 4)		-9		dBm
Out-of-Band 3rd-Order Input Intercept Point - L2/L5 Band		L2/L5 band (Note 6). Measured at the low-band mixer input (Note 4)		-9		dBm
In-Band Mixer Input Referred 1dB Compression Point		Measured at the high-band mixer input		-85		dBm
In-Band Mixer Input Referred 1dB Compression Point – L2/L5 Band		L2/L5 band (Note 6). Measured at the low-band mixer input		-85		dBm
Mixer Input Return Loss		Measured at high-band mixer input		10		dB
Mixer Input Return Loss - L2/L5 Band		Measured at low-band mixer input		8		dB
Image Rejection				25		dB
Image Rejection - L2/L5 Band		L2/L5 band (Note 6)		25		dB
Spurs at High-Band LNA Input		LO leakage		-101		dBm
Spurs at Low-Band LNA Input		L2/L5 band (Note 6). LO leakage		-101		dBm
Spurs at High-Band LNA Input		Reference harmonics leakage		-103		dBm
Spurs at Low-Band LNA Input		L2/L5 band (Note 6). Reference harmonics leakage		-103		dBm
Maximum Voltage Gain		Measured from the high-band mixer input to the baseband analog output	89	96	104	dB
Maximum Voltage Gain for Die Parts		Measured from the high-band mixer input to the baseband analog output; die parts only	83	96	106	dB
Maximum Voltage Gain - L2/L5 Band		L2/L5 band (Note 6). Measured from the low-band mixer input to the baseband analog output	89	96	104	dB
Maximum Voltage Gain for Die Parts - L2/L5 Band		L2/L5 band (Note 6). Measured from the low-band mixer input to the baseband analog output; die parts only	83	96	106	dB
Variable Gain Range		Measured at high-band mixer input	53	59		dB
Variable Gain Range for Die Parts		Measured at high-band mixer input; die parts only	45	59		dB
AC ELECTRICAL CHARACTERISTICS / FILTER RESPONSE
Passband Center Frequency		FBW = 000, FCEN = 1011000 (Note 7)		3.9		MHz
		FBW = 010, FCEN = 1011000 (Note 7)		7.1
		FBW = 001, FCEN = 1101001 (Note 7)		7.6
Passband 3dB Bandwidth		FBW = 000 (Note 7)		2.5		MHz
		FBW = 010 (Note 7)		4.2
		FBW = 001 (Note 7)		8.7
Lowpass 3dB Bandwidth		FBW = 011, single-sided BW (Note 7)		11.7		MHz
		FBW = 111, single-sided BW (Note 7)		8.2
		FBW = 100, single-sided BW (Note 7)		18
Stopband Attenuation		3rd-order filter, bandwidth = 2.5MHz, measured at 4MHz offset (Note 7)		30		dB
Stopband Attenuation		5th-order filter, bandwidth = 2.5MHz, measured at 4MHz offset (Note 7)		50		dB
Passband Flatness		FBW = 001, filter center frequency = 8.9MHz, 5th-order BPF, \|response magnitude at 5.1MHz - response magnitude at 11.6MHz\| (Note 7)		3		dB
AC ELECTRICAL CHARACTERISTICS / HIGH-BAND LNA
Power Gain				18		dB
Power Gain for Die Parts		Die parts only		15		dB
Noise Figure				0.9		dB
Input IP3		(Note 5)		-1.1		dBm
Output Return Loss				10		dB
Input Return Loss		With external matching circuit components of 5.6nH series inductor and 1.7pF shunt capacitor.		10		dB
AC ELECTRICAL CHARACTERISTICS / LOW-BAND LNA
Power Gain				18		dB
Power Gain for Die Parts		Die parts only		16		dB
Noise Figure				0.9		dB
Input IP3		(Note 5)		-1.1		dBm
Output Return Loss				10		dB
Input Return Loss		With external matching circuit components of 8.4nH series inductor and 1.1pF shunt capacitor.		8		dB
AC ELECTRICAL CHARACTERISTICS / FREQUENCY SYNTHESIZER
LO Frequency Range		0.2V < V_TUNE < (V_CC - 0.25V), LOBAND = 0	1525		1610	MHz
LO Frequency Range - L2/L5 Band		0.2V < V_TUNE < (V_CC - 0.25V), LOBAND = 1	1160		1290	MHz
LO Tuning Gain				70		MHz/V
LO Tuning Gain - L2/L5 Band				76		MHz/V
Reference Input Frequency			8		44	MHz
Main Divider Ratio			36		32,767	-
Reference Divider Ratio			1		1023	-
Charge-Pump Current		ICP = 0		0.5		mA
Charge-Pump Current		ICP = 1		1		mA
AC ELECTRICAL CHARACTERISTICS / TXCO INPUT BUFFER/OUTPUT CLOCK BUFFER
Frequency Range		Load = 10kΩ\|\|10pF	8		44	MHz
Output High Level		With respect to ground, I_OH = 10μA (DC-coupled)	2			V
Output High Level for Die Parts		With respect to ground, I_OH = 10μA (DC-coupled); die parts only		2		V
Output Low Level		With respect to ground, I_OL = 10μA (DC-coupled)			0.8	V
Capacitive Slew Current		Load = 10kΩ\|\|10pF, f_CLKOUT = 44MHz		11		mA
Output Load					10\|\|10	kΩ\|\|pF
Reference Input Level		Sine wave	0.5			V_P-P
Clock Output Multiply/Divide Range		x2: max input frequency of 22MHz, x4: max input frequency of 11MHz	/4		x4	-
AC ELECTRICAL CHARACTERISTICS / ADC
ADC Differential Nonlinearity		AGC enabled, 3-bit output		±0.1		LSB
ADC Integral Nonlinearity		AGC enabled, 3-bit output		±0.1		LSB

Note 1:	MAX2771 is production tested at T_A = +25°C. User must program the registers to the specified default settings upon power-up.
Note 2:	Default mode of the IC. PLL is an an integer-N mode with f_COMP = f_TCXO/16 = 1.023MHz and I_CP = 0.5mA. The complex IF filter is configured as a 5th-order Butterworth filter with a center frequency of 4MHz and bandwidth of 2.5MHz. Output data is in a 2-bit sign/magnitude format at CMOS logic levels in the I channel only.
Note 3:	The LNA output connects to the mixer input without a SAW filter between them.
Note 4:	Two tones are located at 12MHz and 24MHz offset frequencies from the GPS center frequency of 1575.42MHz or 1227.6MHz depending on band. Passive pole at the mixer output is programmed to be 13MHz.
Note 5:	Measured from the LNA input to the LNA output. Two tones are located at 12MHz and 24MHz offset frequencies from the GPS center frequency of 1575.42MHz or 1227.6MHz depending on band.
Note 6:	Same global conditions except tune LO to 1223.508MHz which means change PLL integer divider ratio to 1196 and program LOBAND bit to 1.
Note 7:	Filter response measured with PGA gain setting of GAININ = 000100, and mixer pole set to 36MHz (MIXPOLE = 1).

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{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 2\u003c/strong\u003e","data-html":true,"data-content":"Default mode of the IC. PLL is an an integer-N mode with fCOMP = fTCXO/16 = 1.023MHz and ICP = 0.5mA. The complex IF filter is configured as a 5th-order Butterworth filter with a center frequency of 4MHz and bandwidth of 2.5MHz. Output data is in a 2-bit sign/magnitude format at CMOS logic levels in the I channel only."}

{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 3\u003c/strong\u003e","data-html":true,"data-content":"The LNA output connects to the mixer input without a SAW filter between them."}

{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 6\u003c/strong\u003e","data-html":true,"data-content":"Same global conditions except tune LO to 1223.508MHz which means change PLL integer divider ratio to 1196 and program LOBAND bit to 1."}

{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 4\u003c/strong\u003e","data-html":true,"data-content":"Two tones are located at 12MHz and 24MHz offset frequencies from the GPS center frequency of 1575.42MHz or 1227.6MHz depending on band. Passive pole at the mixer output is programmed to be 13MHz."}

{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 7\u003c/strong\u003e","data-html":true,"data-content":"Filter response measured with PGA gain setting of GAININ = 000100, and mixer pole set to 36MHz (MIXPOLE = 1)."}

{"data-trigger":"hover","data-placement":"right","data-toggle":"popover","data-original-title":"\u003cstrong\u003eNote 5\u003c/strong\u003e","data-html":true,"data-content":"Measured from the LNA input to the LNA output. Two tones are located at 12MHz and 24MHz offset frequencies from the GPS center frequency of 1575.42MHz or 1227.6MHz depending on band."}