ES5128

ES5128 4-1/2 digit with LED Features • Max. ±19,999 counts • QFP-44L package • Input full scale range: 200mV or 2V Description ES5128 is a 19,999-count analog-to-digital converter (ADC) with multiplexed LED • Built-in multiplexed LED display driver: display driver. It drives 4-1/2 digits, 4 decimal 4-1/2 digits, 4 decimal points and polarity points and polarity segments. It typically requires a dual +5V/-5V power supply or a • Underrange/Overrange outputs 10V single power with 5V regulator, like 7905 • 10µV resolution on 200mV scale series ICs, for ADC operation. ES5128 has a ±19,999 counts resolution on both 200.00mV • Display Hold and 2.0000V ranges. It features high • Precise 10:1 range select impedance inputs, excellent differential • True differential input and reference linearity, true ratiometric operation and auto • Built-in inverters for RC oscillation circuit. polarity. The underrange and overrange outputs and the 10:1 range changing inputs facilitate the design of autoranging systems. Other Application features include Display Hold and controllable Panel Meter decimal points. V1.0 1 06/03/10 ES5128 4-1/2 digit with LED Pin Assignment QFP-44L DIG2 DIG3 DIG4 SEG_A SEG_B NC SEG_C SEG_D SEG_E SEG_F SEG_G 1 2 3 4 5 6 7 8 9 10 11 44 43 42 41 40 39 38 37 36 35 34 DIG1 DIG0 NC OSC3 OSC1 TEST1 OSC2 DP1 DP2 RANGE DGND 33 32 31 30 29 28 27 26 25 24 23 REF_LO REF_HI IN_HI IN_LO BUFFER NC CREFCREF+ COMMON NC CINT V1.0 SEG_DP VLED GLED ISET DP4_OR TEST2 DP3_UR HOLD VV+ CAZ 12 13 14 15 16 17 18 19 20 21 22 ES5128 2 06/03/10 ES5128 4-1/2 digit with LED Pin Description QFP-44L Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Symbol DIG2 DIG3 DIG4 SEG_A SEG_B NC SEG_C SEG_D SEG_E SEG_F SEG_G SEG_DP VLED GLED ISET DP4_OR TEST2 DP3_UR HOLD Type O O O O O O O O O O O P P O I/O I/O I/O Description LED backplane signal for DIG2 LED backplane signal for DIG3 LED backplane signal for most significant digit LED segment signal for all A segments LED segment signal for all B segments LED segment signal for all C segments LED segment signal for all D segments LED segment signal for all E segments LED segment signal for all F segments LED segment signal for all G segments LED segment signal for all decimal point segments Positive power supply for LED driver circuit Negative power supply for LED driver circuit Adjust the bright(current) of LED segment. Input: Turns on most significant decimal point when HI. Output: Pulled HI when result count exceeds ±19,999. TEST pin. Not Connect. Input: Turn on the 2nd significant decimal point when HI. Output: Pulled HI when result count is less than ±1,000. Input: when floating, ES5128 operates in the free-run mode. When pulled high, the last display reading is held. When pulled LO, the result counter contents are shown incrementing during the de-integrate phase of cycle. Output: Negative going edge occurs when the data latches are upgraded. Can be used as a converter status signal. Negative power supply terminal Positive power supply terminal Integrator amplifier input Integrator amplifier output Set common-mode voltage of 3.2V below V+. Positive connection to external reference capacitor Negative connection to external reference capacitor Buffer amplifier output Negative input voltage terminal Positive input voltage terminal Positive reference voltage terminal Negative reference voltage terminal Ground reference for digital section 3 06/03/10 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 V1.0 VV+ CAZ CINT NC COMMON CREF+ CREFNC BUFFER IN_LO IN_HI REF_HI REF_LO DGND P P I/O I/O O O O O I I I I O ES5128 4-1/2 digit with LED 35 36 37 38 39 40 41 42 43 44 RANGE DP2 DP1 OSC2 TEST1 OSC1 OSC3 NC DIG0 DIG1 Pulled HIGH externally for 2V scale. When HI, decimal point 2 will be on. When HI, decimal point 1 will be on. Output of first clock inverter. Input of second clock inverter. - TEST pin. Not connect. I/O Input of first clock inverter. O Output of second clock inverter. O O LED backplane signal for DIG0 LED backplane signal for DIG1 I I I I/O Absolute Maximum Ratings Characteristic Supply Voltage (V+ to V-) Analog Input Voltage Digital Input Power Dissipation. Flat Package Operating Temperature Storage Temperature Rating 15V V- -0.6 to V+ +0.6 DGND -0.6V to V+ +0.6V 500mW 0℃ to 70℃ -25℃ to 125℃ Electrical Characteristics TA=25℃, 10V between V+ and V- Parameter Zero input reading Ratiometric reading Rollover Error Test Condition Vin=0, 200mV scale Vin=Vref=1V Range=2V +Vin=-Vin=199mV Min. -1 9998 — — 2.8 0.1 10 — 7 Typ. 0 9999 — — 3.2 2 200 0.9 10 Max 1 Units counts 10000 counts 2 1 3.5 counts counts V mA µA mA V Linearity Error 200mV Scale Common Voltage V+ to Common Δcommon=+0.1V Common Sink Current Δcommon=-0.1V Common Source Current Supply Current excluding V+ to V- = 10V LED display current Supply Voltage Range V+ to V- 1.4 14 V1.0 4 06/03/10 ES5128 4-1/2 digit with LED Function Description 1. Normal Operation When ES5128 operates at the oscillation frequency of 120KHz, the conversion period will be 500ms. And the less frequency it has, the longer time it takes to complete one conversion. ES5128 takes input signal from pins IN_LO and IN_HI differentially, and take reference from pins REF_LO and REF_HI. The typical reference voltage is about 1V. A filter capacitor and a protective resistor are recommended at IN_HI and IN_LO terminal as the test circuit of page7. 2. Range Change Function ES5128 has 2 operation ranges such as 200.00mV and 2.0000V. When the pin RANGE is pulled to DGND or keep floating, ES5128 operates at 200.00mV full-scale range. When it is pulled to V+, ES5128 change the input full-scale range to 2.0000V. And the output data still remain the maximum counting number ±19,999. 3. Data Hold Function ES5128 support a data hold function to stop the LED panel upgrading and hold the final data. When the pin HOLD keeps floating, ES5128 operates in free run mode, and the data upgrades after every conversion. When it is pulled to V+, ES5128 enters HOLD mode, the LED panel stops upgrading the output data, And the final data before the HOLD mode is activated is held. 4. Decimal Points Controlled ES5128 can drive 4 decimal points on LED panel. It provides four pins DP1, DP2, DP3 and DP4 to control the decimal points. Connect the pins DP1~DP4 to V+ will turn on the relative decimal points. To turn it off, keep it floating or connect it to DGND. V1.0 5 06/03/10 ES5128 4-1/2 digit with LED 5. LED Display Configuration SEG_A SEG_B SEG_C SEG_D SEG_E SEG_F SEG_G SEG_DP DIG0 DIG1 DIG2 DIG3 DIG4 0A 1A 2A 3A 0B 1B 2B 3B 4B 0C 1C 2C 3C 4C 0D 1D 2D 3D 0E 1E 2E 3E 0F 1F 2F 3F 0G 1G 2G 3G SIGN DP1 DP2 DP3 DP4 V1.0 6 06/03/10 ES5128 4-1/2 digit with LED Test Circuit – 120KHz Crystal Oscillator +5V 50~100pF 120k 10k DIG1 DIG0 NC OSC3 (40) OSC1 TEST1 OSC2 DP1 DP2 (35) RANGE DGND SEG_DP VLED GLED ISET (15) DP4_OR TEST2 DP3_UR HOLD V- (20) V+ CAZ DIG2 (1) DIG3 DIG4 SEG_A SEG_B (5) NC SEG_C SEG_D SEG_E SEG_F (10) SEG_G 20k 1.2V 0.1µ 0.1µ REF_LO REF_HI IN_HI (30) IN_LO BUFFER NC CREFCREF+ (25) COMMON NC CINT VinVin+ +5V -5V V1.0 5k 20k 150k ES5128 7 100k 470n 0.1µ 06/03/10 ES5128 4-1/2 digit with LED Test Circuit – RC Oscillation Circuit +5V 50p 75k 10k DIG1 DIG0 NC OSC3 (40) OSC1 TEST1 OSC2 DP1 DP2 (35) RANGE DGND SEG_DP VLED GLED ISET (15) DP4_OR TEST2 DP3_UR HOLD V- (20) V+ CAZ DIG2 (1) DIG3 DIG4 SEG_A SEG_B (5) NC SEG_C SEG_D SEG_E SEG_F (10) SEG_G 20k 1.2V 0.1µ 0.1µ REF_LO REF_HI IN_HI (30) IN_LO BUFFER NC CREFCREF+ (25) COMMON NC CINT VinVin+ +5V -5V V1.0 5k 20k 150k ES5128 8 100k 470n 0.1µ 06/03/10 ES5128 4-1/2 digit with LED Test Circuit – Single Power operation +10V 50~100pF 120k 10k DIG1 DIG0 NC OSC3 (40) OSC1 TEST1 OSC2 DP1 DP2 (35) RANGE DGND SEG_DP VLED GLED ISET (15) DP4_OR TEST2 DP3_UR HOLD V- (20) V+ CAZ DIG2 (1) DIG3 DIG4 SEG_A SEG_B (5) NC SEG_C SEG_D SEG_E SEG_F (10) SEG_G 20k 1.2V 0.1µ 0.1µ REF_LO REF_HI IN_HI (30) IN_LO BUFFER NC CREFCREF+ (25) COMMON NC CINT VinVin+ +10V 7905 0V (5V) V1.0 5k 20k 150k ES5128 9 100k 470n 0.1µ 06/03/10 ES5128 4-1/2 digit with LED Product Outline: QFP-44 V1.0 10 06/03/10