Analog-to-digital converters VT7106 and VT7107. Reference data

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Analog-to-digital converters VT7106 and VT7107. Reference data

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The BT7106 and BT7107 are high quality, low power, 3,5-bit analog-to-digital converters with direct output to the display. All active components necessary for the operation of the converter are contained in the CMOS chip. It includes: a block of analog-to-digital conversion voltage - code; decoder of seven-segment indicators; interface circuit that controls the indicator (only for VT7106); reference voltage source and clock generator. BT7106 is designed to work with a liquid crystal indicator, and BT7107 - with an LED.

The microcircuit combines high precision and efficiency. The value of zero drift does not exceed 100 µV for the range of 2 V and 10 µV for the range of 200 mV, the value of the input current is 10 dA, the counting error is one unit of the least significant digit. The built-in zero correction system eliminates zero offset without the use of an external setting system. Microcircuits are placed in 40-pin DIP packages, their pinout is shown in fig. 1. The functional purpose of the outputs is given in Table 1, the limiting operating modes (at a temperature of 25 ° C) - in Table 2, the electrical parameters of the circuit (at a supply voltage of 10 V, a temperature of 25 ° C, a clock frequency of 48 kHz, unless otherwise specified other) - in Table 3.

Chip features:

zero indicator readings at zero input voltage;
correct determination of the polarity of the input signal at a very small, within the measurement accuracy, input signal;
low level of input noise;
low power (6 mW) consumed by the microcircuit from the power source (without taking into account the energy consumed by the LCD or LED indicator);
high-resistance differential CMOS input (input impedance - about 1012 ohms);
direct output to the LCD indicator for VT7106 and to the LED indicator for VT7107;
no additional active ingredients;
high linearity of conversion (error - less than one least significant bit);
the presence of an internal reference voltage source with a small temperature drift;
possible applications: digital panel meters, digital multimeters, thermometers, capacitance meters, pH meters, photometers, etc.

Analog-to-digital converters VT7106 and VT7107. Reference data. DIP Chip Package

Rice. 1. DIP chip package

Table 1

Pin number	Pin designation	Output Description
1	V⁺	Positive power supply terminal
2	D1	Units indicator section D control output
3	С1	Section control output From unit indicator
4	V1	Units indicator section B control output
5	A1	Units indicator section A control output
6	F1	Unit indicator F section control output
7	G1	Unit indicator G section control output
8	E1	Units indicator section E control output
9	D2	Section control output 0 of the tens indicator
10	С2	Section control output From tens indicator
11	V2	Section B control output of the tens indicator
12	A2	Section A control output of the tens indicator
13	F2	F section control output of tens indicator
14	E2	Tens indicator section E control output
15	D3	Hundreds indicator D section control output
16	OT	Hundreds indicator section B control output
17	F3	Hundreds indicator F section control output
18	EC	Hundreds indicator E section control output
19	AB4	Control output of both halves of the indicator 1 thousand
20	POL	Control output of the minus sign of the indicator
21	BP GND	Common output of the LCD indicator (for BT7106) Common wire ("ground") of the digital part (for VT7107)
22	G3	Hundreds indicator G section control output
23	A3	Hundreds indicator section A control output
24	NW	Section Control Output From Hundreds Display
25	G2	Tens indicator G section control output
26	V^-	Negative power supply terminal
27	V_INT	Integrator output
28	V_BUF	Integrating resistor connection terminal
29	C_AZ	Auto-Zero Capacitor Connection Terminal
30	V^-_N	Analog input low
31	V⁺_N	Analog high level input
32	AU	Analog ground
33	C^-_REF	Reference voltage capacitor connection terminal
34	C⁺_REF	Reference voltage capacitor connection terminal
35	V^-_REF	External reference voltage connection terminal
36	V⁺_REF	External reference voltage connection terminal
37	TESTS puedo modificarlo	control output
38	OSC3	Clock Capacitor Connection Pin
39	OSC2	Clock resistor connection terminal
40	OSC1	Common connection point for resistor and clock capacitor

Table 2

Parameter name, unit of measure	designation	Parameter
Supply voltage from V^-up to V⁺,AT	V_MAX	15
Input analog voltage, V	V_{BX MAX}	from V^-up to V⁺
Reference input voltage, V	V_{OP MAX}	from V^-up to V⁺
Amplitude of clock pulses, V	V_{A MAX}	from GND to V⁺
Dissipated power, W	N_MAX	0,8
Operating temperature of the crystal, °C	T_OPR	0 70 ...
Storage temperature, ° С	T_STG	-55 ... + 150

Table 3

Parameter name, unit of measure	designation	Normal value			Measurement mode
Parameter name, unit of measure	designation	Min	A type	Max	Measurement mode
Supply voltage (VT7106), V	V_PETE	7	10	12	-
Voltage of both power supplies (VT7 107), V	V_PETE	3,5	5	6	-
Current consumed from the power supply (excluding LED current for ВТ7107), mA	I_DD	-	0,6	1,0	V_N=0
Input leakage current, pA	I_LEAK		1	10	V_N=0
AV4 segment control voltage (VT7106), V	V_LCDS	4	5	6	-
Segment control current (except АВ4, VT7107), mA	I_LED	5	7	-	Voltage on segment 3B
Segment control current АВ4 (ВТ7107), mA	I_LED1	10	15	-	Voltage on segment 3B
Analog ground voltage (with respect to the output of the positive power source), V	V_ANACOM	2,7	3,0	3,3	25 kΩ between ground and power supply positive
Noise level (peak to peak), μV	V_N	-	15	-	At V_N=0 on 200 mV range
Meter readings at zero input voltage		-000,0	±000,0	+000,0	At V_N=0 on 200 mV range
Relative meter readings		999	999/1000	1000	At V_N=V_REF=100mV
Linearity of transformation (maximum deviation from an ideal straight line), number of units of the least significant digit		-1	±0,2	+1	On the 200mV or 2V range
Zero drift µV/ ^°С		-	0,2	1	V_N=0,T_OPR=0...70 ^°C
Unbalance error, LSB count		-1	±0,2	+1	V^-_N=V⁺_N=200 mV
Nonlinearity of the conversion factor, µV/V	C_MRR	-	50	200	V_CM=±1 V, V_N=0 V, range 200 mV

Analog-to-digital converters VT7106 and VT7107. Reference data. BT7106 LSI switching circuit
Rice. 2. Scheme of switching on the LSI BT7106

Analog-to-digital converters VT7106 and VT7107. Reference data. BT7107 LSI switching circuit
Rice. 2. Scheme of switching on the LSI BT7107

The VT7106 microcircuit is powered by a single source with a voltage of 9 ... 10 V, the positive pole of which is connected to pin 1, the negative - to pin 26. To power the VT7107, two 5 V sources are needed. The common point of both sources is pin 21, +5 V is supplied to pin 1, -5 V - to pin 26. The switching circuit of the BIS VT7106 is shown in fig. 2, and VT7107 - in fig. 3.

Microcircuits work as follows (Fig. 4). The measured voltage is applied to the integrating capacitor C_INT within a fixed time interval determined by the clock generator. The charge accumulated by the capacitor will be proportional to the input voltage, provided that the clock frequency and input current are constant.

Analog-to-digital converters VT7106 and VT7107. Reference data. The principle of operation of microcircuits
Rice. 4. The principle of operation of microcircuits

This capacitor is then discharged to zero by a reference signal with polarity opposite to the input. The time interval required for the discharge of the integrating capacitor is measured by a counting pulse counter in order to display the result. It is proportional to the average value of the input signal over the integration time.

Publication: cxem.net

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