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MAX2027 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX2027 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 10 page IF Digitally Controlled Variable-Gain Amplifier _______________________________________________________________________________________ 7 Detailed Description The MAX2027 is a high-performance, digitally con- trolled variable-gain amplifier for use in applications from 50MHz to 400MHz. The MAX2027 incorporates a digital attenuator with a 23dB selectable attenuation range followed by a fixed- gain, high-linearity amplifier. The attenuator is digitally controlled through five logic lines: B0–B4. This on-chip attenuator provides up to 23dB of attenuation with ±0.05dB state-to-state accuracy. The fixed-gain amplifi- er utilizes negative feedback to achieve high stability, gain, linearity, and wide bandwidth. Applications Information Input and Output Matching The MAX2027 incorporates on-chip input and output matching for operation below 250MHz. Use a DC-block- ing capacitor value of 1000pF for pins 3, 12, and 18 (see Figure 1). For operation above 250MHz, external match- ing improves performance. Table 1 and Table 2 provide recommended components for device operation. Digitally Controlled Attenuator The digital attenuator is controlled through five logic lines: B0, B1, B2, B3, and B4. Table 3 lists the attenua- tion settings. The input and output of this attenuator require external DC-blocking capacitors. This attenua- tor insertion loss is 2dB when the attenuator is set to 0dB (B0 = B1 = B2 = B3 = B4 = 0). Pin Description PIN NAME FUNCTION 1, 2, 11 VCC Power Supply. Bypass to GND with capacitors as close to the pin as possible as shown in the typical application circuit (Figure 1). 3 RF_IN Signal Input. See the typical application circuit for recommended component values. Requires an external DC-blocking capacitor. 4, 5, 16, 17, 19, 20, EP GND Ground. Use low-inductance layout techniques on PC board. Solder the exposed pad evenly to the board ground plane. 6–10 B4–B0 Gain-Control Bits. See Table 3 for gain setting. 12 RF_OUT Signal Output. Requires an external pullup choke inductor (52mA typical current) to VCC along with a DC-blocking capacitor (Figure 1). 13 ISET Connect an 825 Ω resistor from ISET to GND. 14 IBIAS Amplifier Bias. Connect to AMPIN (pin 15) through a choke inductor (0.3mA typ). 15 AMPIN Amplifier Input. Requires a DC-coupling capacitor to allow biasing. 18 ATTNOUT Attenuator Output. Requires an external DC-blocking capacitor. COMPONENT VALUE SIZE C1, C3, C4 1000pF 0603 C2, C5 100pF 0603 C6, C7 0.1µF 0603 C10 0.047µF 0603 R1 825 Ω ±1% 0603 R2–R6 47k Ω 0603 L1 330nH 0805 L2 680nH 1008 Table 1. Suggested Components of Typical Application Circuit FREQUENCY COMPONENT VALUE SIZE L3, L4 11nH 0603 300MHz C8, C9 6.8pF 0603 L3, L4 8.7nH 0603 400MHz C8, C9 5pF 0603 Table 2. Suggested Matching Components |
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