Arizona Microtek, Inc.

AZT71

Programmable Capacitive Tuning IC

www.azmicrotek.com

+1-480-962-5881

3

Request a Sample

May 2012, Rev 1.2

spreadsheet.

Table 4 - AZT71 Capacitor Structure

Internal

Capacitor

Min Value

(pF)

Max Value

(pF)

Step Size

(pF)

6.6

6.6

n/a

0

19.2

6.4

0

9.8

1.4

0

1.953

0.063

Total

6.6

37.553

The capacitance in the AZT71 is controlled by an 11-bit shift register with the data input bit definitions shown in Table 5.

The control word data is inputted serially on the rising edge of the CLK signal with bit0 first and bit10 last.

Table 5 - AZT71 Control Word Definition

11-bit Control Word

bit10

bit9

bit8

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

Not Used

MSB

LSB

MSB

---

LSB

MSB

---

---

---

LSB

Figure 4 shows the capacitance value mapping for the AZT71. The detailed Nominal Capacitance Binary Mapping can be

located on the AZM website.