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GP2015 gps receiver rf front end ds4374 issue 3.1 february 2002 ordering information GP2015 ig fp1n (trays, bake & drypack) (supersedes GP2015 ig fp1r) GP2015 ig fp1q (tape mounted, bake & drypack) 48 pin tqfp (-40 c to +85 c) the GP2015 is a small format rf front-end for global positioning system (gps) receivers. equivalent in performance to the gp2010 but in a tqfp package, this product is suited for size-critical applications as the rf area can be reduced by a factor of two to three using miniature surface mount passive components the GP2015 is designed to operate from either 3 or 5 volt supplies. the input to the device is the l1 (1575.42mhz) coarse- acquisition (c/a) code global positioning signal from an antenna (via a low-noise pre-amplifier). the output is 2-bit quantised for subsequent signal processing in the digital domain. the GP2015 contains an on-chip synthesiser, mixers, agc and a quantiser which provides sign and magnitude digital outputs. a minimum of external components is required to make a complete gps front-end. the device has been designed to operate with the gp2021 12-channel gps correlator and gp4020 gps baseband processor, both available from zarlink semiconductor. features ultra miniature tqfp package low voltage operation (3v - 5v) low power - 200mw typ. (3v supply) c/a code compatible on-chip pll including complete vco triple conversion receiver 48-lead surface mount quad flat-pack package sign and magnitude digital outputs compatible with gp2021 and gp4020 correlators applications c/a code global positioning by satellite receivers time standards navigation ?surveying related products and publications data reference twelve-channel correlator gps baseband processor gps orion 12 channel gps receiver reference design gp2000 gps receiver hardware design gp2010/GP2015: using murata safja35m4wc0z00 saw filter gp2021 gp4020 app. note app note. app. brief ds4057 ds5134 an4808 an4855 ab5202 part description 123456789101112 36 35 34 33 32 31 30 29 28 27 26 25 37 38 39 40 41 42 43 44 45 46 47 48 24 23 22 21 20 19 18 17 16 15 14 13 GP2015 fp48 figure 1 - pin connections - top view pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 name if output pll filter 1 pll filter 2 v ee (osc) v cc (osc) v ee (osc) v ee (reg) pref preset v ee (io) clk n/c n/c mag sign opcik- opcik+ v dd (io) pd n test ld v ee (dig) agc - agc + name n/c v cc (dig) ref 2 ref 1 v cc (rf) v ee (rf) v ee (rf) rf input v ee (rf) v ee (rf) v cc (rf) n/c o/p 1- o/p 1+ v cc (2) i/p 2- i/p 2+ v ee (if) v ee (if) o/p 2- o/p 2+ v cc (3) i/p 3- i/p 3+ pin 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 1 zarlink semiconductor inc. zarlink, zl and the zarlink semiconductor logo are trademarks of zarlink semiconductor inc. copyright 2002 , zarli nk semic ondu ct or inc. all rights reserved.
2 GP2015 if strip the input signal to the GP2015 is the gps l1 signal received via an antenna and a suitable lna. the l1 input is a spread spectrum signal at 1575.42mhz with 1.023mbps bpsk modulation. the signal level at the antenna is about -130dbm, spread over a 2.046mhz bandwidth, so the wanted signal is actually buried in noise. the high rf input compression point of the GP2015 means that with subsequent if filtering it is possible to reject large out of band jamming signals, in particular 900mhz as used by mobile telephones.the on-chip pll generates the first local-oscillator frequency at 1400mhz. the output of the front-end mixer (stage 1) at 175.42 mhz can then be filtered before being applied to the second stage. the double-balanced stage 1 mixer outputs are open-collectors, and require external dc bias to v cc . the second stage contains further gain and a mixer with a local oscillator signal at 140 mhz giving a second if at 35.42 mhz. the second stage mixer is also double-balanced with open-collector outputs requiring external dc bias to v cc . the signal from stage 2 is passed through an external filter with a 1db bandwidth of 1.9mhz. the performance of this filter is critical to system performance and it is recommended that a saw filter is used (part number safja35m4wc0z00 , available from murata). the output of the filter then feeds the main if amplifier. this includes 2 agc amplifiers and a third mixer with a local oscillator signal at 31.111 mhz giving a final if at 4.309 mhz. there is an on- chip filter after the third mixer which provides filtering centred on 4.309 mhz. the if output, which has 1k output impedance, is provided for test purposes. all of the signals within the if amplifier are differential including the filter inputs absolute maximum ratings (non-simultaneous) max. supply voltage 7v max. rf input +15dbm max. voltage on any pin v cc /v dd + 0.5v except ld (pin 21) and preset (pin 9), which are 5.5v min. voltage on any pin v ee - 0.5v storage temperature -65 c to +150 c operation junction temperature -40 c to +150 c 10mhz reference input 1.5v pk -pk esd protection the GP2015 device is static sensitive. the most sensitive pins withstand a 750v test by the human body model. therefore, esd handling precautions are essential to avoid degradation of performance or permanent damage to this device. product description the GP2015 receives the 1575.42mhz signal transmitted by gps satellites and converts it to a 4.309mhz if, using triple down-conversion. the 4.309mhz if is sampled to produce a 2-bit digital output. if the GP2015 is used in conjunction with the gp2021 correlator, then the gp2021 provides a sampling clock of 5.714mhz. this converts the if to a 1.405mhz 2-bit digital output at ttl levels. the GP2015 can operate from a single supply from +3v (nominal) to +5v (nominal). a block diagram of the circuit is shown in figure 2. front end mixer vco pll loop filter external loop filter 2nd stage mixer 175.42mhz filter agc agc 3rd stage mixer 4.3mhz filter 35.42mhz filter 5 5 5 31.11mhz 140mhz phase detector voltage regulator 1.400ghz phase- locked loop pll ref i/p 10mhz (ref 2) 40mhz clock o/p (for correlator chip) (opcik +/-) pll lock logic o/p (ld) 1.400ghz (test) agc control +vr -vr sign o/p latch mag o/p latch sign ttl o/p mag ttl o/p sample clock i/p (clk) (5.71mhz ttl) if output (4.309mhz) a -> d converter rf input l1 (1575.42mhz) pll reference oscillator agc capacitor ref 1 i/p (for use with crystal ref only) +1.21v power-on reference i/p (pref) power-on reset o/p (preset) power control power down i/p (pd n ) power-on reset (1) (15) (14) (11) (9) (19) (8) (20) (28) (16,17) (27) (21) (3) (2) (32) (37,38) (40,41) (44,45) (47,48) (23) (24) _ + 2 7 4 9 figure 2 - block diagram of GP2015
3 GP2015 and outputs, except the if output (pin 1), to reduce any common mode interference. the if output is fed to a 2-bit quantiser which provides sign and magnitude (msb and lsb) outputs. the magnitude data controls the agc loop, such that on average the magnitude bit is set (high) 30% of the time. the agc time constant is set by an external capacitor. the sign and magnitude data, sign (pin 15) and mag (pin 14), are latched by the rising edge of the sample clock, clk (pin 11), which is normally derived from the correlator; the gp2021 provides a 5.714mhz (=40/7) clock, giving a sampled if centred on 1.405mhz. the digital interface circuits use a separate power-supply, v dd (io), which would normally be shared with the correlator to minimise crosstalk between the analog and digital sections of the device. on-chip phase-locked loop synthesiser all of the local oscillator signals are derived from an on chip phase locked loop synthesiser. this includes a 1400mhz vco complete with on-chip tank circuit, dividers and phase detector, with external loop filter components. a 10.000mhz reference frequency is required for the pll. this can be achieved by attaching an external 10.000mhz crystal to the on-chip pll reference oscillator (see figure 5). however in most applications the user will need an external source, such as a tcxo, to provide greater frequency stability (see figure 6). an external reference should be ac coupled to ref2 (pin 27); ref 1 (pin 28) should be left open circuit. the three local oscillator signals 1400mhz, 140.0mhz and 31.11mhz are derived from the 1400mhz synthesiser output. the synthesiser also provides a 40 mhz balanced differential output clock (pins 16 & 17) which can be used to clock the gp2021 correlator. the clock is a low level differential signal which helps minimise interference with the analog areas of the circuit. a pll lock-detect output, ld (pin 21), is also provided, which is logic high when the pll is phase- locked to the 10.000mhz reference signal. the vco power-supply incorporates an on-chip regulator to improve the noise-immunity of the pll. this feature is only available when operating with a 5 volt (nominal) supply which is regulated to 3.3 volts internally. this internal regulated supply is referenced to v cc (osc) (pin 5). figure 7 shows the required connections for both 3 volt and 5 volt operation. a further feature of the circuit is the test input (pin 20). when this input is held high the pll is unlocked with the vco at its maximum frequency. power-down capability a power down function is provided on the GP2015, to limit power consumption. this powers down the majority of the circuit except the power-on reset function (see below). if the power down feature is not required, the power- down input, pd n (pin 19), should be connected to 0v dc (=vee/ground). power-on reset function the GP2015 includes a voltage detector which operates from the digital interface supply. this circuit is used to produce a ttl logic low output while the gps receiver power supply is switching on, and produces a logic high output when the power supply voltage has achieved a nominal value. this output can be used to disable the gp2021 correlator while the power supply is switching on. an internal bandgap reference of approximately +1.21v is compared with the voltage on a sense pin, pref (pin 8); when the voltage on this pin exceeds the reference, a ttl logic high level appears at the power-on reset output, preset (pin 9). thus, if the sense input voltage is derived from an external resistive divider from the digital interface supply, v dd (io) (pin 16), such that the sense voltage at nominal v cc is v s , then the supply threshold, vcc(thresh), at which the preset output goes to logic high is:- for a v cc (nom) of 5.0v, v cc (thresh) may be set to approx. 4.0v, giving v s of 1.5v. for a v cc (nom) of 3.0v, v cc (thresh) may be set to approx. 2.4v, giving v s of 1.5v. additional information all the digital inputs and outputs can use a separate power supply to help prevent digital switching transitions interacting with the analog sections of the device, and as an additional precaution, the digital inputs and outputs are on the opposite side of the device to the critical analog pins. v s = v cc (nom) x 1.21 v cc (thresh)
4 GP2015 electrical characteristics the electrical characteristics are guaranteed over the following range of operating conditions (see fig. 3 for test circuit): industrial (i) grade: t amb = -40 c to +85 c supply voltage: v cc and v dd = +2.7v to +5.5v test conditions (unless otherwise stated): supply voltages: v cc = +2.7v and +5.5v, v dd = +2.7v and +5.5v test temperature: industrial (i) grade product: +25 c ma ma ma ma mv s db db dbm nh db db mv rms db db db k mv rms k db db db % % ms dbc/hz dbc/hz dbc/hz dbc/hz dbc/hz dbc/hz dbc pins 5, 26, 29, 35, 39, 46 pin 18 pins 5, 26, 29, 35, 39, 46 pin 18 between any v cc /v dd pins (note 7) (note 7) r o = 600 (note 2) f in = 1575.42mhz z s = 50 (note 7) pin 32 (notes 1 and 7) (notes 1 and 7) pins 37 & 38 (note 8) f in = 1224.58mhz (note 7) f in = 175.42mhz pins 40 & 41 (note 8) pins 44 & 45 (note 8) (note 6) f in = 35.42mhz (note 3) pins 47 & 48 (note 8) cw input (note 3) pin 1(note 8) (note 7 and 9) c agc = 100nf 15khz loop bandwidth (note 7) 77 14.5 6 5 100 25 33 120 +1.0 60 40 supply current normal mode - analog interface - digital interface power down mode - analog interface - digital interface power supply differential power down response time if strip front end/mixer 1 conversion gain (g1) noise figure input compression (1db) input impedance differential output impedance rf input image rejection stage 2/mixer 2 conversion gain (g2) input compression (1db) differential input impedance differential output impedance stage 3 high gain (in terms of total strip) high gain (g3) gain control range differential input impedance if output amplitude if output impedance 4.3mhz filter response flatness 4.3 1mhz rejection @ 0.5mhz @ 50mhz 2 bit quantiser sign duty cycle mag duty cycle agc time constant on-chip pll synthesiser phase noise 1khz 10khz 100khz 1mhz 5mhz 50mhz pll spurs characteristic value typ. max. 55 9 3 3 3 18 9 -16 17 3.4 700 7 27 14 700 500 75 60 1 85 1 14 70 50 30 2 -68 -75 -88 -110 -120 -120 -50 conditions units 11 -22 22 5 106-g1-g2 60 -1.5 45 40 20 min. (note 10) (note 7)
5 GP2015 notes on electrical characteristics:- all rf measurements are made with appropriate matching to the input or output impedances, such as balun transformers, and levels refer to matched 50ohm ports (see figure 3 for test circuit) 1. rf input impedance (series) without input matching components connected - expressed as real impedance with reactive inductor value. measured at 1575.42mhz. 2. input matched to 50ohm, output loaded wlth 600ohm differential 3. maximum stage 3 input signal amplitude for correct agc operation = 20mv rms. 4. vco regulator voltage measured with respect to vcc (osc) - pin 5. 5. the opclk outputs are differential and are referenced to v dd . 6. minimum gain requirement expressions mhz mhz v mhz/v v/rad v pk-pk k h ms db v v v a v a v v ns v v mv p-p % v v v v a h v
6 GP2015 pin descriptions all v ee and v cc /v dd pins must be connected to ensure correct operation pin no. signal name input/output description 1 ifoutput output if test output. connected to output of stage 3 prior to the a to d converter. a series 1k resistor is incorporated for buffering purposes. 2 pll filter 1 output pll filter 1. connected to the bias network within the on-chip vco. an external pll loop filter network should be connected between this pin and pll filt 2 (see below). 3 pll filter 2 output pll filter 2. connected to the varactor diodes within the on-chip vco. an external pll loop filter network should be connected between this pin and pll filt 1 (see above). 4,6 v ee (osc) input negative supply to the on-chip vco. (see note 1) 5v cc (osc) input positive supply to the on-chip vco. 7v ee (reg) input negative supply to the vco regulator. this must be connected to gnd. 8 pref input power-on reset reference input. an on-chip comparator produces a logic hi when the pref input voltage exceeds +1.21v. (nom) (see page 3) 9 preset output power-on reset output. a ttl compatible output controlled by the power-on reset comparator (see above). this output remains active even when the chip is powered down. (see pin 19 - pdn). 10 v ee (io) input negative supply to the digital interface. (see note 2) 11 clk input sample clock input from the correlator chip. a ttl compatible input (which operates at 5.714mhz if used with gp2021 correlator device) used to clock the mag & sign output latches, on the rising edge of the clk signal. 12, 13 n/c not connected. (see note 4) 14 mag output magnitude bit data output. a ttl compatible signal, representing the magnitude of the mixed down if signal. derived from the on-chip 2-bit a to d converter, synchronised to the clk input clock signal. 15 sign output sign bit data output. a ttl compatible signal, representing the polarity of the mixed down if signal. derived from the on-chip 2-bit a to d converter, synchronised to the clk input clock signal. 16 opclk- output 40mhz clock output - inverse phase. one side of a balanced differential output clock, with opposite polarity to pin 17 - opclk+. used to drive a master-clock signal within the correlator chip. 17 opclk+ output 40mhz clock output - true phase. other side of a balanced differential output clock set, with opposite polarity to pin 16 - opclk-. used to drive a master- clock signal within the correlator chip.
7 GP2015 pin no. signal name input/output description 18 v dd (io) input positive supply to the digital interface. (see note 2) 19 pdn input power-down control input. a ttl compatible input, which when set to logic high, will disable all of the GP2015 functions, except the power-on reset block. useful to reduce the total power consumption of the GP2015. if this feature is not required, the pin should be connected to 0v (v ee /gnd). 20 test input test control input - disable pll. a ttl compatible input, which when set to logic high, will disable the on-chip pll, by disconnecting the divided-down vco signal to the phase-detector. the vco will free run at its upper range of frequency operation. if this feature is not required, the pin should be connected to 0v (v ee /gnd). 21 ld output pll lock detect output. a ttl compatible output, which indicates if the pll is phase- locked to the pll reference oscillator. will become logic high only when phase-lock is achieved. 22 v ee (dig) input negative supply to the pll and a to d converter. 23 agc- output agc capacitor output - inverse phase. one side of a balanced output from the agc block within if stage 3, to which an external capacitor is connected to set the agc time-constant. 24 agc+ output agc capacitor output - true phase. one side of a balanced output from the agc block within if stage 3, to which an external capacitor is connected to set the agc time-constant. 25 n/c not connected. (see note 4) 26 v cc (dig) input positive supply to the pll and a to d converter. 27 ref 2 input 10.000mhz pll reference signal input . input to which an externally generated 10.000mhz pll reference signal should be ac coupled, if an external pll reference frequency source (e.g tcxo) is used (see fig. 6). if no external reference is used, this pin forms part of the on- chip pll reference oscillator, in conjunction with an external 10.000mhz crystal (see fig. 5). 28 ref 1 input pll reference oscillator auxillary connection. used in conjunction with pin 27 (ref 2) to allow a 10.000mhz external crystal to provide the pll reference signal if no external pll reference frequency source (e.g tcxo) is used. this pin should not be connected if an external tcxo is being used (see fig. 5). 29, 35 v cc (rf) input positive supply to the rf input and stage 1 if mixer. both pins are connected internally, but must both be connected to v cc externally, to keep series inductance to a minimum. 30, 31, v ee (rf) input negative supply to the rf input and stage 1 if mixer. the 33, 34 pins are all connected internally, but must all be connected to 0v (v ee /gnd) externally, to keep series inductance to a minimum.
8 GP2015 pin no. signal name input/output description 32 rf input input rf input. the gps rf input signal @ 1575.42mhz from an external antenna with lna and filter is connected to this pin via an input-matching network (see fig.4). 36 n/c not connected. (see note 4) 37 o/p 1- output stage 1 mixer output @ 175.42mhz - inverse phase. one of a balanced output from first stage if mixer, to which one input of an external balanced 175mhz bandpass filter is connected. external dc biasing is required via an inductor connected to v cc (rf) - the value of which is dependent on the filter used. 38 o/p 1+ output stage 1 mixer output @ 175.42mhz - true phase. second of a balanced output from first stage if mixer, to which the second input of an external balanced 175mhz bandpass filter is connected. external dc biasing is required via an inductor connected to v cc (rf) - the value of which is dependent on the filter used. 39 v cc (2) input positive supply to the stage 2 if mixer. 40 i/p 2- input stage 2 mixer input @ 175.42mhz - inverse phase. one of a balanced input to the second stage if mixer, to which one of the balanced signal outputs from the external 175mhz bandpass filter is connected. 41 i/p 2+ input stage 2 mixer input @ 175.42mhz - true phase. second of a balanced input to the second stage if mixer, to which the second of the balanced signal outputs from the external 175mhz bandpass filter is connected. 42, 43 v ee (if) input negative supply to the stage 2 if mixer, and stage 3 if block. 44 o/p 2- output stage 2 mixer output @ 35.42mhz - inverse phase. one of a balanced output from second stage if mixer, to which one input of an external balanced 35.42mhz bandpass filter is connected. external dc biasing is required via an inductor connected to v cc . (see note 3) 45 o/p 2+ output stage 2 mixer output @ 35.42mhz - true phase. second of a balanced output from second stage if mixer, to which the second input of an external balanced 35.42mhz bandpass filter is connected. external dc biasing is required via an inductor connected to v cc . (see note 3) 46 v cc (3) input positive supply to the stage 3 if mixer. 47 i/p 3- input stage 3 mixer input @ 35.42mhz - inverse phase. one of a balanced input to the third stage if mixer, to which one of the balanced signal outputs from the external 35.42mhz bandpass filter is connected. (see note 3) 48 i/p 3+ input stage 3 mixer input @ 35.42mhz - true phase. second of a balanced input to the third stage if mixer, to which the second of the balanced signal outputs from the external 35.42mhz bandpass filter is connected. (see note 3)
9 GP2015 notes on pin descriptions 1). both pins 4 & 6 (v ee (osc)) are connected internally. if the vco regulator is used (v cc = +5.00v nominal) then both pins 4 & 6 must be left floating, with either pin de-coupled to v cc (osc) with a 100nf capacitor. in this configuration, the dc output level of the regulator can be monitored from v ee (osc), with respect to v cc (osc) - not 0v (v ee /gnd). for operation at v cc <+4.0v, the vco regulator cannot be used, and both v ee (osc) pins must be shorted to v ee (reg) (pin 7) - see fig. 7. 2). the digital interface supply is independent from all the other supply pins, allowing supply separation to reduce the likelihood of undesirable digital signals interfering with the if strip. (note the maximum allowable power supply differential in the electrical characteristics - page 4). 3). the 35.42mhz bandpass filter should have a bandwidth of approx 2.0mhz. 4). these pins are not connected within the package, and may therefore be used in power/ground routing if desired. to avoid crosstalk, their use in signal routing is not recommended. operating notes a typical application circuit is shown in figure 4 with the GP2015 front-end interfaced to the gp2021 12-channel correlator integrated circuit. the rf input has an unmatched input impedance (see page 4). the rf input matching components cs and cp should be mounted as close to the rf input as possible: also the vee(rf) tracks must be kept as short as possible. a saw filter may be used as a 175.42mhz filter, but this can be replaced by a simpler coupled-tuned lc filter if there is no critical out-of-band jamming immunity requirement. the dc bias to mixer 1 is provided via inductors l1 and l2, which may form part of the 175.42mhz filter. the output of mixer 2 requires an external dc bias, achieved with inductors l3 and l4, which also serve to tune out the input capacitance of the 35.42mhz saw filter. the output of the saw filter is tuned with inductor l5. capacitor (cagc) determines the agc time-constant. the pll loop filter components are selected to give a pll loop bandwidth of approximately 10khz. the if output is normally used for test-purposes only, but is available to the user if required. typically a low noise preamplifier (gain >+15db) is figure 3 - GP2015 test circuit stage 2 stage 3 agc control m1 m2 m3 m4 rf input cs stage 1 output 175 mhz stage 2 input 175 mhz stage 2 output 35 mhz stage 3 input 35 mhz c1 c2 r1 if output clk sign mag cagc opclk ld ref 2 test pdn 1 14 24 pll loop filter preset pref 23 15 11 48 47 45 44 41 40 38 37 32 2 cp 3 16 17 21 pll synthesiser 27 20 power down 19 power detect 98 agc control adc stage 3 m4 m3 stage 2 m2 m1 stage 1 m1 - 4 = matching networks, incorporating balun transformers c1 = 470nf c2 = 10nf r1 = 270 cagc = 100nf cs = 12pf cp = 2.7pf used between the antenna and the rf input (pin 32), and may be located remotely, with the antenna. quality and reliability at zarlink semiconductor, quality and reliability are built into products by rigorous control of all processing operations, and by minimising random, uncontrolled effects in all manufacturing operations. process management in- volves full documentation of procedures, recording of batch- by-batch data, and the use of traceability procedures. a common information management system is used to monitor the manufacturing on zarlink semiconductor cmos and bipolar processes. all products benefit from the use of an integrated monitoring system throughout all manu- facturing operations, leading to high quality standards for all technologies. further information is contained in the quality bro- chure, available from zarlink semiconductor's sales of- fices. lh power down normal operation powered down test normal operation test control signals
10 GP2015 GP2015 front-end 48 pin 175mhz filter l4 saw filter l3 l1 l2 l5 cs cp cagc =0.1uf gp2021 correlator 80 pin clk_t clk_i sign 0 mag 0 pll lock 17 16 11 samp clk 15 14 21 9 24 33, 34, 30,31 23 32 37 38 40 41 44 45 47 48 vcc ref2 10mhz i/p pll loop filter c1 = 0.47uf r1 = 270 c2 = 10nf c1 c2 r1 rf input rf input matching cs = 12pf cp = 2.7pf 2 3 820 power-on ref r2 r4 r5 r6 r3 vcc power-on ref ladder r3 =2.7k r2 = 2.7k (vcc = +3.0v) = 6.8k (vcc = +5.0v) 27 4, 6 vcc creg = 0.1uf (vcc = +5.0v only) values for l1,l2,l3,l4 & l5 are dependent on filters used power_good 2 66 77 76 73 71 70 r4, r5 = 470 r6 = 1.5k figure 4 - GP2015 typical application figure 5 - crystal reference connections (28) (27) 33pf 10.000mhz crystal ref 1 ref 2 GP2015 22pf
11 GP2015 figure 6 - tcxo reference connections (28) (27) ref 1 ref 2 GP2015 nc 47nf 10.000mhz tcxo rb ra ra & rb set to reduce tcxo o/p to 0.5v p-p. figure 7 - vco power-supply connections GP2015 GP2015 100nf v ccosc v eeosc v eereg (5) (4) (6) (7) 3v 0v no vco regulator needed v ccosc v eeosc v eereg (5) (4) (6) (7) 5v 0v using vco regulator with vcc > +4.0v
12 GP2015 typical characteristics of the GP2015 gps receiver rf front-end the GP2015 has been characterised to guarantee reliable operation over the industrial temperature range (-40 c -> +85 c ambient). this was achieved by setting the device case temperature to extremes of +110 c and -50 c. the following charts show the typical variation of key parameters across the extended case temperature range. note:- all measurements at vcc = +2.65v made with vco voltage-regulator disabled. figure 8 - supply current - analog interface - normal mode figure 9 - supply current - analog interface - power-down mode case temp( c) 30 35 40 45 50 55 60 65 70 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v current (ma) case temp( c) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v current (ma)
13 GP2015 figure 11 - supply current - digital interface - power-down mode case temp( c) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v current (ma) figure 10 - supply current - digital interface - normal mode case temp( c) 0 2 4 6 8 10 12 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v current (ma)
14 GP2015 figure 12 - noise figure of if chain in a typical application circuit case temp( c) 0 2 4 6 8 10 12 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v noise figure (db) figure 13 - on-chip phase-locked-loop synthesiser loop gain case temp( c) 146.5 147 147.5 148 148.5 149 149.5 150 150.5 151 -60 -40 -20 0 20 40 60 80 100 120 loop gain (db) vcc = +2.65v vcc = +3.8v vcc = +5.55v
15 GP2015 figure 14 - on-chip phase-locked-loop synthesiser phase-detector gain case temp( c) 3 3.5 4 4.5 5 5.5 6 -60 -40 -20 0 20 40 60 80 100 120 phase-detector gain (v/radian) vcc = +2.65v vcc = +3.8v vcc = +5.55v figure 15 - on-chip phase-locked-loop synthesiser - low and high limits of vco frequency for pll to be locked (note that this a typical characteristic and cannot be guaranteed) case temp( c) 1000 1100 1200 1300 1400 1500 1600 -60 -40 -20 0 20 40 60 80 100 120 low - 2.65v high - 2.65v low - 3.8v high - 3.8v low - 5.55v high - 5.55v vco frequency (mhz) note:- 1400mhz is the nominal vco frequency
16 GP2015 figure 16 - on-chip phase-locked-loop synthesiser - phase-noise of vco producing 1400mhz cw signal at 10khz offset (15khz pll loop bandwidth) case temp ( c) -90 -85 -80 -75 -70 -65 -60 -40 -20 0 20 40 60 80 100 120 10khz offset 100khz offset note: vcc = +5.55v for each offset phase noise (dbc/hz) figure 17 - on-chip phase-locked-loop synthesiser - phase-noise of vco producing 1400mhz cw signal at 100khz offset (15khz pll loop bandwidth) case temp ( c) -124 -122 -120 -118 -116 -114 -112 -110 -60 -40 -20 0 20 40 60 80 100 120 1mhz offset 5mhz offset note: vcc = +5.55v for each offset phase noise (dbc/hz)
17 GP2015 figure 18 - frontend/mixer 1 small-signal conversion gain - rf i/p frequency at 1575.42mhz case temp ( c) 16.5 17 17.5 18 18.5 19 19.5 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v gain (db) figure 19 - frontend/mixer 1 input level for 1db conversion gain-compression - rf i/p frequency at 1575.42mhz case temp ( c) -20 -19 -18 -17 -16 -15 -14 -13 -12 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v input level (dbm)
18 GP2015 figure 20 - frontend/mixer 1 image rejection - rf i/p frequency at 1224.58mhz case temp( c) 5 5.5 6 6.5 7 7.5 8 8.5 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v rf i/p image rejection (db) case temp( c) 24 24.5 25 25.5 26 26.5 27 27.5 28 -60 -40 -20 0 20 40 60 80 100 120 gain (db) vcc = +2.65v vcc = +3.8v vcc = +5.55v figure 21 - stage 2/mixer 2 small-signal conversion gain - stage 2 i/p frequency at 175.42mhz
19 GP2015 figure 22 - stage 2/mixer 2 input level for 1db conversion gain-compression - stage 2 i/p frequency at 175.42mhz case temp ( c) 8 10 12 14 16 18 20 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v input level (mv rms) case temp( c) 74 75 76 77 78 79 80 -60 -40 -20 0 20 40 60 80 100 120 gain (db) vcc = +2.65v vcc = +3.8v vcc = +5.55v figure 23 - stage 3 maximum small-signal conversion gain - stage 3 i/p frequency at 35.42mhz
20 GP2015 figure 24 - power-on reset threshold level case temp ( c) 1.215 1.22 1.225 1.23 1.235 1.24 1.245 1.25 1.255 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v pref voltage (v) figure 25 - duty-cycle of mag digital output (pin 14), sampled at 5.71mhz in a typical application circuit - rf i/p signal = 1575.42mhz cw, -85dbm - equivalent to 26db excess noise from a typical gps antenna case temp( c) 28 28.5 29 29.5 30 30.5 31 31.5 32 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v duty cycle (%)
21 GP2015 figure 26 - duty-cycle of sign digital output (pin 15), sampled at 5.71mhz in a typical application circuit - rf i/p signal = 1575.42mhz cw, -85dbm - equivalent to 26db excess noise from a typical gps antenna case temp( c) 50 50.05 50.1 50.15 50.2 50.25 50.3 50.35 50.4 50.45 50.5 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v duty cycle (%) figure 27 - amplitude of ifout (pin 1) at 4.3mhz ( 1.0mhz) in a typical application circuit - rf i/p signal = 1575.42mhz cw, -85dbm - equivalent to 26db excess noise from a typical gps antenna case temp( c) 70 72 74 76 78 80 82 84 86 88 90 -60 -40 -20 0 20 40 60 80 100 120 vcc = +2.65v vcc = +3.8v vcc = +5.55v amplitude (mv rms)
22 GP2015 figure 28 - typical matched rf i/p impedance between 1000mhz and 2000mhz rf i/p level @ -40dbm -j 0.5 - j 1 -j 3 j 0.5 j 1 j 3 0 0.3 1 3 3 2 1 1 2 3 +110 c +25 c -50 c 49.2 + j13.3 ohms impedance at 1575.42mhz 50.9 + j9.2 ohms 52.1 + j4.9 ohms 12pf 2.7pf rf input (32) GP2015 vee (30, 31, 33, 34) 50 ohm line from network analyser matching components

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