The ADG708 is a low on-resistance, dual 4-channel multiplexer/demultiplexer manufactured by Analog Devices. It is designed for switching analog signals with minimal distortion and high-speed operation. The device is ideal for applications requiring precise signal routing, such as audio, video, and data communication systems. Its low on-resistance and high linearity make it suitable for high-performance analog signal processing.
The ADG708 is available in a 16-lead TSSOP or LFCSP package. Below is the pin configuration and description:
Pin Number | Pin Name | Description |
---|---|---|
1 | S1A | Source 1 for channel A |
2 | S2A | Source 2 for channel A |
3 | S3A | Source 3 for channel A |
4 | S4A | Source 4 for channel A |
5 | D1 | Drain for channel A |
6 | VSS | Ground (0 V reference) |
7 | IN1 | Logic control input for channel selection |
8 | IN2 | Logic control input for channel selection |
9 | EN | Enable pin (active low) |
10 | VDD | Positive supply voltage |
11 | D2 | Drain for channel B |
12 | S4B | Source 4 for channel B |
13 | S3B | Source 3 for channel B |
14 | S2B | Source 2 for channel B |
15 | S1B | Source 1 for channel B |
16 | NC | No connection |
Power Supply:
Channel Selection:
Enable/Disable:
Signal Routing:
Decoupling Capacitor:
The ADG708 can be controlled using an Arduino UNO to select channels and route signals. Below is an example code snippet:
// Define control pins for ADG708
const int IN1 = 2; // Connect to Arduino digital pin 2
const int IN2 = 3; // Connect to Arduino digital pin 3
const int EN = 4; // Connect to Arduino digital pin 4
void setup() {
// Set control pins as outputs
pinMode(IN1, OUTPUT);
pinMode(IN2, OUTPUT);
pinMode(EN, OUTPUT);
// Enable the ADG708
digitalWrite(EN, LOW); // Active low enable
}
void loop() {
// Select Channel 1
digitalWrite(IN1, LOW);
digitalWrite(IN2, LOW);
delay(1000); // Wait for 1 second
// Select Channel 2
digitalWrite(IN1, LOW);
digitalWrite(IN2, HIGH);
delay(1000); // Wait for 1 second
// Select Channel 3
digitalWrite(IN1, HIGH);
digitalWrite(IN2, LOW);
delay(1000); // Wait for 1 second
// Select Channel 4
digitalWrite(IN1, HIGH);
digitalWrite(IN2, HIGH);
delay(1000); // Wait for 1 second
}
No Signal Output:
High Signal Distortion:
Device Overheating:
Unexpected Behavior:
Q: Can the ADG708 handle digital signals?
A: Yes, the ADG708 can switch both analog and digital signals, provided they are within the supply voltage range.
Q: What is the maximum signal frequency the ADG708 can handle?
A: The ADG708 has a bandwidth of 200 MHz, making it suitable for high-frequency signals.
Q: Can I use the ADG708 with a 3.3 V microcontroller?
A: Yes, the ADG708 operates with supply voltages as low as 2.7 V, making it compatible with 3.3 V systems.
Q: How do I reduce crosstalk between channels?
A: Use proper PCB layout techniques, such as separating signal traces and using ground planes, to minimize crosstalk.