Microcircuits K174XA2 and K174UR3. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Microcircuits K174XA2 and K174UR3. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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Chip K174XA2 is intended for use in broadcasting superheterodyne receivers of classes I-III with amplitude modulation. This chip contains the following nodes: high frequency amplifier. double balanced mixer with separate local oscillator and IF amplifier with AGC. Its functional diagram and connection diagram are shown in fig. 1 (1 - UHF; 2 - local oscillator; 3 - mixer; 4 - UHF; 5 - UHF AGC UHF; 6 - UPT AGC UHF).

Fig.1 (click to enlarge)

Main Specifications

Supply voltage. B, no more	9
Consumption current, mA	6 13 ...
Sensitivity at 20 dB signal-to-noise ratio at a frequency of 1060 kHz. µV, no more	20
Output voltage, mV	60

Structurally, the K174XA2 chip is framed in the 238.16-1 package. Its dimensions are shown in Fig. 2.

Chips K174XA2 and K174UR3
Ris.2

Limiting performance data

Supply voltage	16
Input signal frequency, MHz	30
Consumption current, mA	16
Ambient temperature, ° С	-25. . . +56

Chip K174URZ designed for use in broadcast superheterodyne FM receivers. This microcircuit contains the following nodes: amplifier-limiter. frequency detector and LF preamplifier. Its functional diagram and connection diagram are shown in fig. 3 (1 - limiting amplifier, 2 - frequency detector, 3 - bass amplifier).

Chips K174XA2 and K174UR3
Ris.3

Main Specifications

Supply voltage	6
Consumption current. mA, no more	12
Output voltage LF, mV, not less than	100
Amplitude modulation suppression ratio, dB, not less than	40
These settings are intended at; input signal voltage, µV.........	500
input signal frequency, MHz	10.7
deviation and frequency, kHz	50
Limiting performance data
Power supply voltage, V	9
Limit input voltage, µV, max	100
Maximum input signal voltage, mV	300
Ambient temperature. FROM	-25 ... + 55

Structurally, the K174URZ chip is framed in the 201.14.1 package. Its dimensions are shown in Fig. four.

Chips K174XA2 and K174UR3
Ris.4

Publication: N. Bolshakov, rf.atnn.ru

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