lmx2377u National Semiconductor Corporation, lmx2377u Datasheet
lmx2377u
Related parts for lmx2377u
lmx2377u Summary of contents
Page 1
... General Description The LMX2377U device is a high performance frequency synthesizer with integrated dual modulus prescalers. The LMX2377U device is designed for use as a local oscillator for the first and second dual conversion radio trans- ceiver. A 16/ 32/33 prescale ratio can be selected for the Main synthesizer ...
Page 2
Functional Block Diagram www.national.com 2 20022604 ...
Page 3
Connection Diagrams Thin Shrink Small Outline Package (TM) (Top View) Ultra Thin Chip Scale Package (SLE) (Top View) Pin Descriptions Pin Pin No. Pin No. Name 20-Pin UTCSP 24-Pin CSP Main ...
Page 4
... I/O TSSOP 6 I Main prescaler complementary input. For single ended operation, this pin should be AC grounded. The LMX2377U Main PLL can be driven differentially when the bypass capacitor is omitted. 7 — Ground for the Main PLL analog circuitry Reference oscillator input. It has an approximate V threshold and can be driven from an external CMOS or TTL logic gate ...
Page 5
... Model Temperature Range LMX2377USLEX −40˚C to +85˚C LMX2377USLBX −40˚C to +85˚C LMX2377UTM −40˚C to +85˚C LMX2377UTMX −40˚C to +85˚C Package Description Packing Ultra Thin Chip Scale 2500 Units Per Reel Package (UTCSP) Tape and Reel Chip Scale Package ...
Page 6
Detailed Block Diagram Notes supplies power to the Main and Aux prescalers, Main and Aux feedback dividers, Main and Aux reference dividers, Main and Aux phase detectors, the OSC CC buffer, and F LD circuitry Vµc ...
Page 7
Absolute Maximum Ratings Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Supply Voltage V to GND CC V Main to GND P V Aux to GND P ...
Page 8
Electrical Characteristics Main = V Aux = Vµc = 3.0V, −40˚C ≤ Symbol Parameter MAIN SYNTHESIZER PARAMETERS ID Main Main Charge Pump Output Source o SOURCE Current ID Main Main Charge Pump Output ...
Page 9
Electrical Characteristics Main = V Aux = Vµc = 3.0V, −40˚C ≤ Symbol Parameter AUX SYNTHESIZER PARAMETERS ID Aux Aux Charge Pump Output Source o SOURCE Current ID Aux Aux Charge Pump Output ...
Page 10
Electrical Characteristics Main = V Aux = Vµc = 3.0V, −40˚C ≤ Symbol Parameter DIGITAL INTERFACE (Data, LE, Clock High-Level Input Voltage IH V Low-Level Input Voltage IL I High-Level Input ...
Page 11
... Sensitivity Test Setup section in Note 9: Refer to the LMX2377U Serial Data Input Timing section Note 10: Normalized Phase Noise Contribution is defined measured at an offset frequency bandwidth. The offset frequency, f, must be chosen sufficiently smaller than the PLL’s loop bandwidth, yet large enough to avoid substantial phase noise contribution from the reference source ...
Page 12
... Typical Performance Characteristics Sensitivity www.national.com LMX2377U f Main Input Power Vs Frequency Main = Vµ LMX2330U f Main Input Power Vs Frequency Main = Vµ 20022642 20022643 ...
Page 13
... Typical Performance Characteristics Sensitivity (Continued) LMX2377U f Aux Input Power Vs Frequency Aux = Vµ LMX2377U f Aux Input Power Vs Frequency Aux = Vµ 20022646 20022647 www.national.com ...
Page 14
... Typical Performance Characteristics Sensitivity (Continued) www.national.com LMX2377U OSC Input Voltage Vs Frequency Vµc = 3.0V CC LMX2377U OSC Input Voltage Vs Frequency Vµ 20022652 20022653 ...
Page 15
... Typical Performance Characteristics Charge Pump LMX2377U Main Charge Pump Sweeps −40˚C ≤ T ≤ +85˚C, Vµ 20022660 www.national.com ...
Page 16
... Typical Performance Characteristics Charge Pump (Continued) www.national.com LMX2377U Aux Charge Pump Sweeps −40˚C ≤ T ≤ +85˚C, Vµ 20022661 ...
Page 17
... LMX2377U CSP f Main and f Aux Input Impedance Vµc = 3.0V +25˚ LMX2377U TSSOP f Main and Vµc = 5.5V 20022666 LMX2377U CSP f Main and Vµc = 5.5V 20022668 17 Aux Input Impedance = +25˚C A 20022667 Aux Input Impedance = +25˚C A 20022669 www.national.com ...
Page 18
www.national.com 18 ...
Page 19
... Typical Performance Characteristics Input Impedance (Continued) LMX2377U UTCSP f Main and f Aux Input Impedance Vµc = 3.0V +25˚ LMX2377U UTCSP f Main and Vµc = 5.5V 20022697 19 Aux Input Impedance = +25˚C A 20022697 www.national.com ...
Page 20
www.national.com 20 ...
Page 21
... Typical Performance Characteristics Input Impedance (Continued) LMX2377U TSSOP OSC LMX2377U CSP OSC Input Impedance Vs Frequency +25˚C A Input Impedance Vs Frequency +25˚ 20022676 20022677 www.national.com ...
Page 22
www.national.com 22 ...
Page 23
... Typical Performance Characteristics Input Impedance (Continued) LMX2377U UTCSP OSC Input Impedance Vs Frequency +25˚ 200226A1 www.national.com ...
Page 24
www.national.com 24 ...
Page 25
Charge Pump Current Specification Definitions I1 = Charge Pump Sink Current − ∆ Charge Pump Sink Current Charge Pump Sink Current at VD ...
Page 26
... Test Setups The block diagram above illustrates the setup required to measure the LMX2377U device’s Main charge pump sink current. The same setup is used for the LMX2370TMEB/ LMX2370SLEEB Evaluation Boards. The Aux charge pump measurement setup is similar to the Main charge pump measurement setup ...
Page 27
... Test Setups (Continued) The block diagram above illustrates the setup required to measure the LMX2377U device’s Main input sensitivity level. The same setup is used for the LMX2370TMEB/ LMX2370SLEEB Evaluation Boards. The Aux input sensitiv- ity test setup is similar to the Main input sensitivity test setup. ...
Page 28
... Test Setups (Continued) The block diagram above illustrates the setup required to measure the LMX2377U device’s OSC level. The same setup is used for the LMX2370TMEB/ LMX2370SLEEB Evaluation Boards. This setup is similar to the f sensitivity setup except that the signal generator is IN now connected to the OSC ...
Page 29
... RF1 OUT connector of the evaluation board and the desired operating frequency is set. The typical frequency range selected for the LMX2377U device’s Main synthesizer is from 100 MHz to 2500 MHz. The standards will be located down the length of the RF1 OUT transmission line. The transmission line adds electrical length and acts as an offset from the reference plane of the Network Analyzer ...
Page 30
... Test Setups (Continued) LMX2377U Serial Data Input Timing Notes: 1. Data is clocked into the 22-bit shift register on the rising edge of Clock 2. The MSB of Data is shifted in first. www.national.com 20022610 30 ...
Page 31
... A 16/ 32/33 prescale ratio can be selected for the LMX2377U Main synthesizer. On the other hand, the Aux PLL is only intended for single ended operation 16/17 prescale ratio can be selected for the LMX2377U Aux synthesizer. 1.4 PROGRAMMABLE FEEDBACK DIVIDERS (N COUNTERS) ...
Page 32
... Main 1.8 MULTI-FUNCTION OUTPUTS The LMX2377U device’s F output that can be configured as the Main synthesizer Fast- Lock output, an open drain analog lock detect output, counter reset, or used to monitor the output of the various reference divider (R counter) or feedback divider (N counter) circuits ...
Page 33
... PWDN refers to either the PWDN Main or PWDN Aux bit. (Continued) 1.9 POWER CONTROL Each synthesizer in the LMX2377U device is individually power controlled by device powerdown bits. The powerdown word is comprised of the PWDN Main (PWDN Aux) bit, in conjuction with the TRI-STATE ID Aux) bit. The powerdown control word is used to set the operating mode of the device ...
Page 34
Programming Description 2.1 MICROWIRE INTERFACE The 22-bit shift register is loaded via the MICROWIRE interface. The shift register consists of a 20-bit Data[19:0] Field and a 2-bit Address[1:0] Field as shown below. The Address Field is used to decode ...
Page 35
35 www.national.com ...
Page 36
Programming Description 2.4 AUXILIARY R REGISTER The Aux R register contains the Aux R_CNTR, PD_POL Aux, ID bits that compose the F LD control word. The detailed description and programming information for each control word is o discussed in ...
Page 37
Programming Description 2.4.4 TRI-STATE ID Aux AUXILIARY SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT o The TRI-STATE ID Aux bit allows the charge pump to be switched between a normal operating mode and a high impedance o output state. This happens ...
Page 38
Programming Description 2.5.3 PRE Aux AUXILIARY SYNTHESIZER PRESCALER SELECT The Aux synthesizer utilizes a selectable dual modulus prescaler. Control Bit Register Location PRE Aux Aux N[20] 2.5.4 PWDN Aux AUXILIARY SYNTHESIZER POWERDOWN The PWDN Aux bit is used to ...
Page 39
Programming Description 2.6.2 PD_POL Main MAIN SYNTHESIZER PHASE DETECTOR POLARITY The PD_POL Main bit is used to control the Main synthesizer’s phase detector polarity based on the VCO tuning characteristics. Control Bit Register Location PD_POL Main Main R[17] 2.6.3 ...
Page 40
Programming Description 2.7 MAIN N REGISTER The Main N register contains the Main N_CNTRA, Main N_CNTRB, PRE Main, and PWDN Main control words. The Main N_CNTRA and Main N_CNTRB control words are used to setup the programmable feedback divider. ...
Page 41
Programming Description 2.8 F LD[3:0] MULTI-FUNCTION OUTPUT SELECT o The F LD control word is used to select which signal is routed to the LD3 F LD2 F LD1 F LD0 ...
Page 42
Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 20-Pin Thin Shrink Small Outline Package (TM) NS Package Number MTC20 42 ...
Page 43
Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 24-Pin Chip Scale Package (SLB) NS Package Number SLB24A 43 www.national.com ...
Page 44
... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...